www.unal.edu.co/icn/publicaciones/caldasia.htm Freire et al. Caldasia 29(1):23-38. 2007 EPIDERMAL CHARACTERS OF BACCHARIS (ASTERACEAE) SPECIES USED IN TRADITIONAL MEDICINE Caracteres epidérmicos de las especies del género Baccharis (Asteraceae) usadas en la medicina popular SUSANA E. FREIRE ESTRELLA URTUBEY DANIEL A. GIULIANO División Plantas Vasculares, Museo de La Plata, Paseo del Bosque, 1900 La Plata, Argentina. freire@museo.fcnym.unlp.edu.ar ABSTRACT A morphological study of 38 species of Baccharis used in traditional medicine was carried out to provide some epidermal characters that will contribute to the knowledge of the genus. The present study revealed: 1) seven different types of trichomes: conical, aseptate flagellate, filiform flagellate, 1-armed, 2-4-armed, bulbiferous flagellate, and glandular biseriate; 2) that 28 of the total of 38 species have trichomes in tufts; 3) six different types of stomata: anomocytic, anisocytic, cyclocytic, actinocytic, tetracytic, and staurocytic; 4) that some trichome types, such as 2-4-armed (B. dracunculifolia) and aseptate flagellate branched (B. trinervis), show a high diagnostic value; 5) that the stomata types can be used to differentiate species with similar trichomes type (e.g. B. trimera and B. articulata). Illustrations of the studied characters are provided. Key words. Baccharis, Compositae, medicinal species, stomata, trichomes. RESUMEN Se realizó un estudio de caracteres epidérmicos de las hojas de las 38 especies de Baccharis usadas en la medicina popular. El análisis de los caracteres revela: 1) siete tipos de tricomas: cónicos, flageliforme aseptados, filiformes flagelados, 1-armados, 2-4-armados, bulbíferos flagelados y glandulares biseriados; 2) que 28 especies del total de 38 especies medicinales estudiadas presentan tricomas en “nidos pilosos”; 3) que seis tipos de estomas están presentes: anomocíticos, anisocíticos, ciclocíticos, actinocíticos, tetracíticos y estaurocíticos; 4) que algunos tricomas muestran un alto valor diagnóstico, por ejemplo, los tricomas 2-4-armados son exclusivos de B. dracunculifolia y los flagelados-aseptados ramificados están presentes sólo en B. trinervis; 5) que los tipos de estomas permiten la diferenciación de especies con igual tipo de tricoma, (por ejemplo B. trimera de B. articulata). Se incluyen ilustraciones de los caracteres diagnósticos. Palabras clave. Baccharis, Compositae, especies medicinales, aparatos entomáticos, tricomas. 23 Medicinal Baccharis INTRODUCTION Baccharis L. is one of the largest genera of the tribe Astereae (Nesom, 1994). It comprises c. 400 American species of shrubs or subshrubs, occasionally small trees and herbs, nearly all dioecious. According to Zin (1922), Amat (1983), Zardini (1984), Girault (1987), Boldt (1989), Correa & Bernal (1990), Iharlegui & Hurrell (1992), Soria (1993), Heinrich (1996), Rojas et al. (1999), Pérez-García et al. (2001), Erazo et al. (2002), Baggio et al. (2003), Vidari et al. (2003), Souza (2004), and a recent webpage (HardingBarlow), 38 medicinal species of Baccharis with folk medicinal use (or mentioned at least as medicinal herbs) are recognized (Table 1); many of these species can be distinguished by their leaf or winged stem morphology (Appendix 1). In 22 of these species biological activity was tested (Gutkind et al. 1981, Vidari et al. 2003, Verdi et al. 2005). Baccharis megapotamica and B. pedunculata are also included in this study since they can be considered promisory medicinal species judging from their tested biological activity (Verdi et al. 2005). Heering (1899), Volkens (1890), Quentin (1911), Ariza Espinar (1973), Barroso (1976), Pertusi (1987), Hellwig (1990, 1992), Müller (2006) and, are among authors who have contributed most to the solving taxonomic problems through the analysis of micromorphology of leaf surface in Baccharis. Epidermal traits, i.e. epidermal cells, stomata, and hairs, have proven to be an important tool in taxa delimitation in many plant families (e.g. Lackey 1978, Metcalfe & Chalk 1950-1979, Sinclair & Sharma 1971, Uphof et al. 1962), and also in distinguishing medicinal species since 24 drugs of pharmaceutical use are made up of dried and bruised parts in which the different macroscopical characteristics of the species are not generally distinguishable (e.g. Amat, 1988; Rapisarda et al., 1997). Within this context, this study pretend to contribute to the knowledge of the medicinal species of the genus Baccharis. MATERIAL AND METHODS The study was performed using dried leaves or winged stems (if only bract-like leaves are present) taken from herbarium specimens (Appendix 2). Accepted names, synonyms, vernacular names, distribution, medicinal uses, and biological activity for each studied species are given in Table 1. The epidermal microcharacters were studied in samples cleared using the technique of Dizeo de Strittmatter (1973), and stained ussing safranin in 80% ethanol. Measurements of stomata (length) were taken using a Nikon light microscope equipped with an ocular micrometer. The average size of stomata was determined based on measurements performed on 1520 replicates per sample. Descriptive terminology for the trichomes basically follows Ramayya (1962). Whenever possible, additional synonyms of trichome terminology were added (Ariza Espinar 1973, Metcalfe & Chalk 1989, Müller 2006). The classification of anticlinal epidermal cell wall patterns follows Stace (1965). Stomata types were classified according to Stace (1965), Van Cotthem (1970), Metcalfe & Chalk (1979). The nomenclature of the included species follows Matuda (1957), Cuatrecasas (1967), Ariza Espinar (1973), Barroso (1976), Giuliano (2000) and Oliveira et al. (2006). Drawings were made by the authors using a microscope Leitz SM Lux with camera lucida. Freire et al. Table 1. Distribution, vernacular names, folk medicinal uses and tested biological activity of Baccharis species. AN = Antilles; AR = Argentina; BO = Bolivia; BR = Brazil; CH = Chile; CO = Colombia; CR = Costa Rica; EC = Ecuador; ES = El Salvador; GU = Guatemala; HO = Honduras; ME = Mexico; NC = Nicaragua; PA = Paraguay; PE = Peru; PN = Panama. UR = Uruguay; US = United States; VE = Venezuela. Folk medicinal use vagina and wounds wash, general infections (Souza, 2004) Tested biological activity Species Distribution Vernacular name Baccharis anomala DC. Pingraea anomala (DC.) F.H. Hellwig AR, BR, PA, UR -- AR, UR “mío-mío blanco”, “pichana blanca”, “romerillo”, “romerillo blanco”, “romerillo malo” (Argentina). antirrheumatic, for treating traumatisms (Zardini, 1984) antifeedant (Verdi et al., 2005) Baccharis articulata (Lam.) Pers. Conyza articulata Lam; Molina articulata (Lam.) Less.; Pingraea articulata (Lam.) F.H. Hellwig AR, BO, BR, PA, UR “caápé guasú”, “carqueija”, “carqueja”, “carqueja amarga”, “carqueja blanca”, “carqueja cenicienta”, “carqueja crespa”, “carqueja gris”, “carquejilla”, “chirca melosa” (Paraguay), “cola de yacaré”, “planta del yaguareté”, “yaguaretá-caá” (Argentina); “carqueja”, “carqueja-do-morro”, “vassoura” (Brazil). digestive, hepatoprotective, diuretic, antirrheumatic, antiseptic, for male sexual impotence, for female sterility (Zardini, 1984) antioxidant (Verdi et al., 2005) Baccharis boliviensis (Wedd.) Cabrera Heterothalamus boliviensis Wedd.; Pseudobaccharis boliviensis (Wedd.) Cabrera; Psila boliviensis (Wedd.) Cabrera AR, BO, CH, PE “chijua”, “romero”, “tola” (Argentina). medicinal (Erazo et al., 2002) antibacterial (Erazo et al., 2002) allelopathic (Verdi et al., 2005) ME “quauhizquiztli” (Mexico). for stomachache, laxative, stornutatory, for baldness, for insect bites (Heinrich, 1996) spasmolytic, antibacterial (Verdi et al., 2005) AR, BO, BR, PA, UR “ajenjo del campo”, “mío”, “mío-mío”, “neo-neo”, “neomo”, “nía”, “nío”, “niyo”, “ñío-ñío”, “romerillo” (Argentina); “mio-mio” (Brazil). digestive, sudorific (Amat, 1983) antiviral, allelochemical, antioxidant, citotoxic, insecticide (Verdi et al., 2005) AR, BR, PA, UR “carqueija”, “carqueja”, “carqueja crespa”, “carquejilla” (Argentina), “yaguaretéka’á” (Paraguay). digestive, hepatoprotective, antispasmodic, against fever, antirrheumatic, antiseptic (Zardini, 1984) antibiotic (Gutkind et al., 1981) antifeedant, antimicrobial, antioxidant (Verdi et al., 2005) Baccharis artemisioides Hook. & Arn. B. conferta Kunth Baccharis xalapensis Kunth; Baccharis orizabaensis Sch. Bip. ex Hemsl. Baccharis coridifolia DC. Eupatorium montevidense Spreng. Baccharis crispa Spreng. Molina crispa (Spreng.) Less; M. cylindrica Less.; Baccharis cylindrica (Less.) DC.; B. genistelloides var. crispa (Spreng.) Baker; B. genistelloides var. cylindrica (Less.) Baker; B. perplexa I.L. Teodoro & J.E. Vidal; Pingraea crispa (Spreng.) F.H. Hellwig -- 25 Medicinal Baccharis Folk medicinal use antiinflammatory, for favouring scaring (in cows; Correa & Yesid Bernal, 1990) for treating sores and wounds (Boldt, 1989) Tested biological activity Species Distribution Vernacular name Baccharis decussata (Klatt) Hieron. Pluchea decussata Klatt; Baccharis moritziana Hieron. CO, EC, PE, VE “almanga”, “armanga”, “machimbí” (Colombia). Baccharis douglasii DC. Baccharis haenkei DC. ME, US -- AR, BO, BR, PA, UR “caápé guasú”, “chilca”, “chilca-y”, “chilca mata ojo”, “suncho” (Argentina); “alecrim-de-vassoura”, “alecrim-do-campo”, “vassourinha” (Brazil). abortive (Iharlegui & Hurrell, 1992) -- AR, BR, PA, UR “carqueja” (Argentina, Brazil). digestive, hepatoprotective, antiseptic (Zardini, 1984) citotoxic (Verdi et al., 2005) Baccharis genistelloides (Lam.) Pers. Conyza genistelloides Lam.; Molina reticulata Ruiz & Pav.; Baccharis reticulata (Ruiz & Pav.) Pers. BO, CH, CO, EC, PE “charara”, “jatun kimsa kuchu”, “nuchu-kuchu”, “quimsa-kuchu”, “tres espigas” (Bolivia); “chilca” (Colombia); “cuchu-cuchu”, “muqumuqu”, “nudo-nudo”, “qimsa-kuchu” (Peru). astringent, diuretic, antirrheumatic, for paludism, for gonorrhea, for chest-ache, for stomach-ache (Correa & Yesid Bernal, 1990) antiviral, gastroprotective (Verdi et al., 2005) Baccharis genistifolia DC. AR, BR, UR -- antispasmodic (Zardini, 1984) -- Baccharis grisebachii Hieron. Baccharis abietina Kuntze; B. rosmarinifolia var. andicola Hauman AR, BO “chilca mamil”, “quinchamal”, “quinchamalí”, “romerillo”, “tancha” (Argentina). for treating wounds (Zardini, 1984) antimicrobial, citotoxic, protein synthesis (Verdi et al., 2005) Baccharis heterophylla Kunth Baccharis cuneata DC.; Baccharis spathulata S. Schauer GU, ME -- for gastrointestinal disorders (Rojas et al., 1999) antimicrobial, spasmolytic (Verdi et al., 2005) Baccharis illinita DC. BR, PA -- for gastric disorders (Baggio et al., 2003) gastroprotective (Verdi et al., 2005) AR, BO, CO, EC, PE, VE “chilca” (Argentina); “aurauchu”, “yurakchilka” (Bolivia); “algodoncillo”, “buéntsamo”, “buétsemo”, “chilca”, “chilca blanca”, “chilca negra”, “chilca rucia”, “chilco”, “chilco blanco”, “chilco negro”, “chilquilla negra teñidora”, “chirca”, “chirco”, “gurrubo” (Colombia); “chilca”, “chilca negra”, “chiza”, “yana chilca” (Ecuador); “chilka” (Peru); “botonera”, “niquitao” (Venezuela). tonic, antidiabetic, antirrheumatic, vulnerary, emolient, disinfectant, for diarrhoea, for inflammation, for pulmonar affections (Correa & Yesid Bernal, 1990) -- Baccharis dracunculifolia DC. Baccharis leptospermoides DC.; B. bracteata Hook. & Arn.; B. dracunculifolia var. integerrima Kuntze f. subviscosa Kuntze; B. tandilensis Speg.; B. dracunculifolia f. spectabilis Heering Baccharis gaudichaudiana DC. Baccharis articulata var. gaudichaudiana (DC.) Baker Baccharis latifolia (Ruiz & Pav.) Pers. Molina latifolia Ruiz & Pav.; Baccharis poliantha Kunth; B. floribunda Kunth; B. riparia Kunth; Pluchea glabra Griseb.; Baccharis polyantha f. genuina Hieron.; B. polyantha var. macrophylla Hieron; Pingraea latifolia (Ruíz & Pav.) F.H. Hellwig 26 -- -- Freire et al. Species Baccharis linearis (Ruíz & Pav.) Pers. Molina linearis Ruiz & Pav.; Baccharis rosmarinifolia Hook. & Arn.; B. lingulata Less.; B. linifolia Meyen; B. rosmarinifolia var. subsinuata DC.; B. callistemoides Walp.; B. subandina Phil.; B. rosmarinifolia var. callistemoides (Walp.) Heering; B. rosmarinifolia var. subandina (Phil.) Heering; B. holmbergii Hicken Distribution AR, CH Vernacular name Folk medicinal use Tested biological activity “romerillo” (Argentina). for arterial blood, for pyorrhea (San Martín, 1983) antispasmodic, antirrheumatic, vulnerary, for inflammations, for wounds, for catarrh (Zin, 1922) insect repelent, allelopathic, citotoxic, antifeedant (Verdi et al., 2005) Baccharis megapotamica Spreng. Baccharis pyramidalis Gardner AR, BR, PA, UR -- potentially medicinal Baccharis microcephala (Less.) DC. Molina microcephala Less.; B. microptera Baker AR, BR, PA, UR “carqueija”, “carqueja” (Argentina); “carqueja”, “cambará” (Brazil), “yaguareté-ka’á” (Paraguay). allelochemical, cerebral toxicity, antileukemic, antibiotic, antiinflammatory, analgesic (Verdi et al., 2005) digestive, hepatoprotective, antiseptic (Zardini, 1984) -- ME -- against catarrhs, for urinary problems (Heinrich, 1996) -- BO, CO, EC, PE, VE “chilca blanca”, “chilco blanco”, “chilco negro”, “chilquilla arenilla”, “espadero”, “humadero” (Colombia). for cough, for bronchitis, for pulmonar affections (Girault, 1987) -- AR, BR, PA, UR “carqueija”, “carqueja” (Argentina). antirrheumatic (Zardini, 1984) antibiotic (Gutkind et al., 1981) antimicrobial (Verdi et al., 2005) -- antifungal (Verdi et al., 2005) Baccharis multiflora Kunth Neomolina multiflora (Kunth) F.H. Hellw. Baccharis nitida (Ruiz & Pav.) Pers. Molina nitida Ruiz & Pav.; Baccharis prinoides Kunth; B. cassinoides auct. non DC.; B. oronocensis DC.; B. popayanensis Hieron.; B. oronocensis var. perua Cuatrec.; B. nitida f. angustifolia Cuatrec.; B. lepidota Gilli Baccharis notosergila Griseb. Baccharis curtifolia S. Moore Baccharis odorata Kunth CO, PE -- Baccharis pedunculata (Mill.) Cabrera Conyza pedunculata Mill.; Eupatorium cotinifolium Willd.; Baccharis cotinifolia (Willd.) Urb.; Pseudobaccharis cotinifolia (Willd.) I.L. Teodoro; Baccharis cinnamomifolia Kunth; Psila cinnamomifolia (Kunth) Aristeg.; Baccharis venusta Kunth; B. speciosa DC.; Eupatorium braunii Pol.; Baccharis braunii (Pol.) Standl.; B. splendens Heering; B. ibaguensis Cuatrec. for influenza, for colds, for bone fractures and dislocations (Girault, 1987) AN, BO, CO, CR, EC, GU, HO, ME, NI, PN, PE, VE “chilca”, “chilca teñidora” (Colombia). potentially medicinal 27 Medicinal Baccharis Species Distribution Vernacular name Baccharis pentlandii DC. Baccharis fallax Kuntze; B. rubricaulis Rusby BO, PE -- Baccharis pilularis DC. Baccharis congesta DC.; B. consanguinea DC.; B. pilularis var. consanguinea (DC.) Kuntze; B. pilularis subsp. consanguinea (DC.) C.B. Wolf ME, US “coyote brush” (US). US, Central and South America “chilca”, “chilca amarga”, “chilca blanca”, “chilca dulce”, “chilca hû”, “chirca”, “jarilla”, “jarilla del río”, “junco”, “romerillo”, “suncho”, “vara dulce”, “yuno” (Argentina); “chilca” (Bolivia); “chilca”, “chilco” (Colombia); “axixtlacotl” (Mexico); “chilca” (Peru); “mulefat”, “seep willow”, “water wally” (US). Baccharis salicifolia (Ruíz & Pav.) Pers. Molina salicifolia Ruíz & Pav.; M. striata Ruíz & Pav.; M. viscosa Ruíz & Pav.; M. parviflora Ruíz & Pav.; Baccharis glutinosa Pers.; B. parviflora (Ruíz & Pav.) Pers.; B. lanceolata Kunth, B. iresinoides Kunth; B. farinosa Spreng.; B. longipes DC.; B. coerulescens DC.; B. alamanii DC.; B. longifolia DC.; B. marginalis DC.; B. chilquilla DC.; B. linifolia DC.; B. viscosa (Ruíz & Pav.) Kuntze; B. viscosa var.nigricans Kuntze; B. marginalis var. longipes Heering; B. lanceolata Kunth emend. Heering; B. purpurascens Heering; Pingraea salicifolia (Ruíz & Pav.) F.H. Hellwig; P. viscosa (Ruíz & Pav.) F.H. Hellwig Baccharis sarothroides A. Gray Baccharis sarothroides var. pluricephala Jeps.; B. arizonica Eastw. Baccharis scandens (Ruíz & Pav.) Pers. Molina scandens Ruíz & Pav.; Baccharis adscendens Pers.; B. fevillei DC.; B. petiolata DC.; B. calliprinos Griseb.; B. mirabilis Heering; Pingraea scandens (Ruíz & Pav.) F.H. Hellwig Baccharis serrifolia DC. Baccharis kellermanii Greenm.; Archibaccharis prorepens S.F. Blake; Baccharis prorepens (S.F. Blake) J.D. Jacks. Baccharis teindalensis Kunth Baccharis capitata Kunth 28 Folk medicinal use antirrheumatic, antiseptic, disinfectant, for cough, for pneumonia, for sprains, for bone fractures and dislocations (Girault, 1987) for treating hay fever, sinusitis, frontal headaches, to prevent baldness, as a female hygienic agent (HardingBarlow, ined.) diuretic, against fevers, diaphoretic, for headache, for inflammation, for diarrhoea, for dysentery (Heinrich, 1996) antirrheumatic, antisyphilitic (Zardini, 1984) for colds, for relieving sore muscles (Heinrich, 1996) laxative, expectorant, for bronchitis, for pulmonar affections (Girault, 1987) antirrheumatic, for wounds (Zin, 1922) Tested biological activity gastroprotective, antiviral (Verdi et al., 2005) -- -- citotoxic (Verdi et al., 2005) ME, US “desert broom” (US). AR, CH, PE “chascoma”, “chilca”, “chilca dulce”, “fía mate”, “palo blanco”, “suncho blanco” (Argentina). GU, HO, ME, NI -- for gastrointestinal illnesses (Heinrich, 1996) antispasmodic (Verdi et al., 2005) -- antiinflammatory, analgesic, antimicrobial (Vidari et al., 2003) antiviral (Verdi et al., 2005) antiulceral, antidiarrhoeic (Vidari et al., 2003) CO, EC -- Freire et al. Species Distribution Vernacular name Folk medicinal use Tested biological activity Baccharis tola Phil. Baccharis microphylla var. incarum Wedd.; B. lejia Phil.; B. magellanica var. subviscosa Kuntze; B. magellanica var. subviscossima Kuntze; B. tola var. lejia (Phil.) Reiche; B. incarum (Wedd.) Perkins; B. tafiensis Heering; B. incarum var. lejia (Phil.) Cabrera; B. tola var. incarum (Wedd.) Joch. Müller AR, BO, CH, PE “baila buen”, “lejía”, “tola”, “tola lejía” (Argentina). medicinal (PérezGarcía et al., 2001) protein synthesis, antibacterial, antiinflammatory (Verdi et al., 2005) “china-thula”, “chilka”, “hirwa-kowa” (Bolivia); “anisillo”, “sanalotodo” (Colombia); “tayanqa” (Peru); “chilca”, “sanalotodo” (Venezuela). vulnerary, antidiabetic, antianemic, antirrheumatic, antiseptic, disinfectant, for wounds, for headache, for bronchitis (Correa & Yesid Bernal, 1990) -- AR, BR, BO, PA, PE, UR “carqueja” (Argentina, Brazil); “nuchu-kuchu”, “quimsa-kuchu” (Bolivia), “yaguaretéka’á” (Paraguay). for renal affections, for varix (Correa & Yesid Bernal, 1990) digestive, hepatoprotective, antiseptic, for female sterility (Zardini, 1984) vasorelaxant, moluscicide, antimutagenic, hepatoprotective (Verdi et al., 2005) Baccharis trinervis Pers. Conyza trinervis Lam.; Baccharis laxa Gardner; Heterothalamus trinervis (Pers.) Hook. & Arn.; Pseudobaccharis trinervis (Pers.) Badillo; P. trinervis (Pers.) I. L. Teodoro; Psila trinervis (Pers.) Cabrera AR, BO, BR, CO, EC, GU, HO, ME, NI, PA, PE, PN, UR, VE “chiñi kimsa kuchu” (Bolivia); “árnica”, “barzalito”, “barzalito de monte”, “chaparral de bestia”, “chilca”, “chilquita”, “chipolo”, “gavilana”, “lengua de gato”, “machucha”, “mandaguasca”, “marucha”, “varejón” (Colombia); “alcotan” (Ecuador); “Santa María” (Panama); “canaciche”, “chilquita”, “niquitaíto” (Venezuela). antihemorrhoidal, antiinflammatory, antirrheumatic, for waist-ache, for jaundice, for male sexual impotence, for female sterility (Correa & Yesid Bernal, 1990) for treating fever, oedemas, sores, muscle cramps, gastrointestinal disorders (Heinrich, 1996) antiviral, antiinflammatory, antioxidant (Verdi et al., 2005) Baccharis vaccinioides Kunth Baccharis confertoides G.L. Nesom ES, GU, HO, ME -- for gastrointestinal disorders (Heinrich, 1996) -- Baccharis wrightii A.Gray ME -- for head disorders emetic (Boldt, 1989) -- Baccharis tricuneata (L. f.) Pers. Erigeron tricuneatum L. f.; Baccharis microphylla Kunth Baccharis trimera (Less.) DC. Molina trimera Less.; Baccharis genistelloides var. trimera (Less.) Baker BO, CO, EC, PE, VE 29 Medicinal Baccharis RESULTS AND DISCUSSION Epidermal characters (Table 2) Leaf pubescence. All studied species of Baccharis are pubescent (only a few, e.g. B. dracunculifolia and B. trinervis are subglabrous at maturity). Two major groups of indumentum can be distinguished within the medicinal species, one consisting of isolated trichomes and the other with trichomes in tufts (= “nidos pilosos”, Ariza Espinar, 1973; = “Haarnester”, Hellwig 1992). Seven different types of trichomes were found: (1) Conical trichomes: uniseriate, 5-6-celled with body gradually narrowed to a sharp point. Cells longer distally, often nodulose at the joints. Lateral and cross walls slightly thickened. This trichome type is present in B. anomala and B. decussata. (Fig. 1 A). Similiar trichomes were illustrated by Müller (2006) for B. decussata subsp. jelskii (sub “pedestal hair”) and by Ariza Espinar (1973) for the non-medicinal B. pulchella. (2) Aseptate flagellate trichomes (or whip trichomes, Metcalfe & Chalk 1989): uniseriate, 2-3-celled with body differentiated in stalk and a long, whip-like terminal cell. Stalk 1-2-celled, cells usually isodiametrical or broader than long. (2) (a) Simple: terminal cell very long, flagellate, tubular, as wide as the cells of the stalk. This trichome type is present in B. artemisioides and B. grisebachii (Fig. 1 E), which have discolorous leaves with white-lanate abaxial surface. Trichomes of B. artemisioides were previously analyzed and illustrated by Ariza Espinar (1973) and Pertusi (1987). The aseptate flagellate trichomes of B. grisebachii were illustrated by Hellwig (1992) and by Müller (2006), sub “flagellate filiform” and “filiform hair” respectively. (2) (b) Branched: three to five whip trichomes (with stalk 1-4-celled) appearing 30 stellately branched from the only stalk cell. This trichomes type is present isolated only in B. trinervis (Fig. 1 B). (3) Filiform flagellate trichomes: uniseriate, many-celled, body filiform to cilindrical and slightly tapering above. Cells usually broader than long, isodiametrical, or slightly longer than broad, with lateral walls convex. Terminal cell relatively short, tail-like and pointed (B. multiflora, B. serrifolia and B. wrightii, in the latter the trichomes are only found on the stem, Fig. 1 C) or pear-like and rounded at the apex (B. megapotamica, Fig. 1 D); those with tail-like apical cell can be straight or incurved. Dense contents have been seen in the terminal cell of these trichomes, which probably have secretory function. (4) 1-armed trichomes: uniseriate, 3-4-celled, with body differentiated into stalk and head. Stalk 2-3-celled, cells usually broader than long, lateral walls straight. Head 1-celled (occasionally branched at the base), with thick lateral and cross walls and pointed or rounded at the apex. This trichome type is present forming tufts or pilose nests only in B. crispa (Fig. 1 F). It was previously analyzed and illustrated by Ariza Espinar (1973) for B. crispa. Hellwig (1992) found trichomes 1-armed in a non-medicinal species, B. rhomboidalis and also in B. macraei and B. pilcensis (Hellwig, 1990). (5) 2-4-armed trichomes: uniseriate, 4-5celled, with body differentiated into stalk and head. Stalk 3-4-celled, cells broader than long with lateral walls convex. Head 1-celled, cell 2, 3 or 4-branched (falls/ collapsing at maturity). This trichome type is present forming tufts or pilose nests (associated or not to glandular trichomes) only in B. dracunculifolia. (Fig. 1 G). Müller (2006) described and illustrated these trichomes of Baccharis dracunculifolia as “uniseriate hairs with branched terminal cells”. Hellwig (1992) found 4-armed trichomes in a non-medicinal species B. erioclada. Table 2: Epidermal characters Trichomes isolated or paired Trichomes conical Trichomes aseptate flagellate Trichomes glandular present Trichomes glandular absent branched simple B. decussata B. anomala B. trinervis B. artemisioides B. grisebachii Trichomes filiform flagellate Trichomes with apical cell pear-like B. megapotamica Trichomes with apical cell taillike B. multiflora B. serrifolia B. wrightii Trichomes in tufts Trichomes 2-4-armed Trichomes 1-armed B. dracunculifolia B. crispa Trichomes bulbiferous flagellate subtype b Apical cell triangular Apical cell tail-like Stomata cyclocytic Stomata actinocytic B. articulata B. gaudichaudiana B. notosergila B. heterophylla B. conferta B. pilularis B. teindalensis B. tricuneata B. vaccinioides B. illinita Stomata medium: (35) 40-60 μm long Stomata anomocytic Stomata actinocytic Stomata cyclocytic B. douglasii B. genistifolia B. microcephala B. pedunculata B. tola B. linearis B. nitida B. odorata B. sarothtoides B. genistelloides Stomata small: 20-30 μm long Anticlinal epidermal cell walls sinuate B. pentlandii Anticlinal epidermal cell walls straight Stomata anomocytic B. latifolia B. scandens Stomata actinocytic B. salicifolia 31 Freire et al. Stomata cyclocytic Trichomes bulbiferous flagellate subtype c Stomata large: 75-100μm long Medicinal Baccharis longer than broad or isodiametrical, terminal cells of the stalk 2, swollen, sphaerical or oblong-ovoid in shape. Head 1-celled, long, flagellate. This trichome type is present only in B. boliviensis. (Fig. 1 H). Similar trichomes are also present in the unrelated non-medicinal B. pingraea (Hellwig, 1992). Figure 1. Trichomes.- A-E, Isolated trichomes. A: conical, B. anomala, B: aseptate flagellate branched, B. trinervis; C and D, Filiform flagellate. C: B. multiflora; D: B. megapotamica; E: aseptate flagellate simple, B. artemisioides; F-L, Tufted trichomes (“pilose nest”) of eglandular trichomes and biseriate glandular trichomes. F: 1-armed trichome, B. crispa; G: 2-4-armed trichomes, B. dracunculifolia; H: bulbiferous flagellate, subtype a, B. boliviensis; I and J, Bulbiferous flagellate, subtype b. I: B. notosergila; J: B. teindalensis; K and L, Bulbiferous flagellate, subtype c. K: B. pedunculata; L: B. tola. (6) Bulbiferous flagellate trichomes: uniseriate, 5-6-celled, usually forming tufts or pilose nests with glandular trichomes. According to the number of subapical cells and the lenght of the apical cell, three subtypes can be distinguished: Subtype a: body differentiated into stalk and head. Stalk 2-3-celled, cells slightly 32 Subtype b: body with cells usually enlarging above, resulting cuneate in shape. Terminal cell short with dense contents, broadly triangular (broadly triangular in B. notosergila or narrowly triangular in B. articulata, B. gaudichaudiana, and B. trimera) or more often tail-like, i.e. sharply delimited from the subapical cell (B. conferta, B. heterophylla, B. pilularis, B. teindalensis, B. tricuneata, B. vaccinioides). (Fig. 1 I, J). Trichomes of B. articulata and B. trimera were previously analyzed and illustrated by Pertusi (1987). Hellwig (1992) found trichomes with tail-like apical cell in the unrelated non-medicinal B. paniculata. Subtype c: this type represents a modification of the subtype a with a differentiated head constituted by a flagellate cell, equal or longer than body, tapering above. This trichome type is present as isolated trichomes in three species, B. anomala, B. coridifolia, and B. trimera, and forms tufts or pilose nests in 16 of the 38 studied species. (Fig. 1 K, L). Bulbiferous trichomes with flagellate apical cell of the medicinal species B. linearis and B. salicifolia were previously illustrated by Ariza Espinar (1973) and Hellwig (1992) respectively. Müller (2006) illustrated for B. coridifolia two types of trichomes, i.e. bulbiferous flagellate subtype b (sub “uniseriate hairs”) and aseptate flagellate (sub “filiform hairs”). (7) Biseriate glandular trichomes: such trichomes are constituted by 2 rows of cells in the body. Biseriate glandular trichomes are widespread in many taxa studied. They form tufts with non-glandular trichomes; Freire et al. occasionally, tufts are constituted exclusively by two or three glandular trichomes (e.g. B. vaccinioides). Stomata (Fig.2): eleven species (B. boliviensis, B. conferta, B. linearis, B. nitida, B. odorata, B. pilularis, B. salicifolia, B. sarothroides, B. teindalensis, B. tola, and B. tricuneata) have actinocytic stomata (Fig. 2 A, B), with five to seven subsidiary cells radially. One species (B. crispa) has anisocytic stomata (Fig. 2 C), with three subsidiary cells, of which one is smaller than the other two. Six species (B. articulata, B. gaudichaudiana, B. genistelloides, B. heterophylla, B. illinita, and B. notosergila) have cyclocytic stomata (Fig. 2 E, F), with four to seven subsidiary cells forming a narrow ring. In three species (B. boliviensis, B. conferta, B. salicifolia) with predominantly actinocytic stomata, a few tetracytic stomata are present (Fig. 2 B), which have four subsidiary cells, two lateral and two polar. Only one of this species (B. conferta) has also staurocytic stomata (Fig. 2 A), with four subsidiary cells with anticlinal walls arranged crosswise to its guard cells. The remaining species have anomocytic stomata (Fig. 2 D, G). Cyclocytic stomata in B. articulata, anisocytic stomata in B. trimera, and anomocytic stomata in B. artemisioides were previously reported by Pertusi (1987). Ariza Espinar (1973) analyzed and illustrated actinocytic stomata in B. salicifolia (anomocytic sensu Ariza Espinar), anomocytic stomata in B. coridifolia, and anisocytic stomata in B. crispa (anomocytic sensu Ariza Espinar). The majority of the species have stomata between 20 to 60 μm long. In only three species the stomata are more than 60 μm long, i.e. Baccharis articulata and B. gaudichaudiana, between 60 to 75 μm long, and B. illinita with stomata between 75 to 105 μm long. Most of the species analyzed have amphistomatic leaves, only twelve species, i.e. Baccharis anomala, B. decussata, B. dracunculifolia, B. grisebachii, B. heterophylla, B. illinita, B. latifolia, B. megapotamica, B. multiflora, B. pedunculata, B. serrifolia, and B. trinervis. Anticlinal epidermal cell walls (on abaxial surface): only three species (B. anomala, B. decussata, and B. pentlandii) amongst the medicinal species, have sinuate anticlinal wall (Stace’s types 5-6). The remaining species have straight to slightly undulate anticlinal walls (Stace’s types 1-2). CONCLUSIONS Certain anatomical characters allow to the distinction of medicinal species of Baccharis. For example: 1) B. trinervis is recognized from other medicinal species by its branched aseptate flagellate trichomes that are unique within the whole genus; 2) filiform trichomes with pear-like apical cell are exclusive of B. megapotamica; 3) only two species, among medicinal species, B. artemisioides and B. grisebachii, have aseptate flagellate trichomes; 4) B. boliviensis and B. dracunculifolia can be recognized among medicinal species by its bulbiferous trichomes with two subapical cell and 2-4-armed trichomes, respectively; 5) B. illinita is distinguished from other medicinal species by its large stomata of 75-100 μm. Other characters, such as stomata type and epidermal cell walls, can be used to differentiate species with similar type of trichomes, as a secondary feature. In B. articulata, B. gaudichaudiana, B. notosergila, and B. trimera, the trichomes are bubiferous flagellate with triangular apical cell; however, B. trimera can be distinguished by its anisocytic stomata. In B. heterophylla the trichomes are bulbiferous flagellate with taillike apical cell, as well as in B. conferta, B. pilularis, B. teindalensis, B. tricuneata, and B. vaccinioides; however, B. heterophylla can be differentiated from them by its cyclocytic stomata. Baccharis pentlandii has 33 Medicinal Baccharis Figure 2. Stomata.- A: actinocytic and staurocytic stomata, B. conferta; B: actinocytic and tetracytic stomata, B. boliviensis; C: anisocytic stomata, B. crispa; D: anomocytic stomata, B. trimera; E: cyclocytic stomata, B. notosergila; F: cyclocytic stomata, B. illinita; G: anomocytic stomata, B. pentlandii. bulbiferous flagellate trichomes with long apical cell, which is a common type within medicinal species, but it can be distinguished by its sinuate anticlinal epidermal cell walls on abaxial surface. pencil illustrations and Anabela S. de Oliveira and Arturo Granda Paucar for providing relevant bibliography. Support for this study by the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina, is gratefully acknowledged. ACKNOWLEDGEMENTS LITERATURE CITED Thanks are given to Jochen Müller and two anonimous reviewers for their valuable comments on the manuscript. Special thanks to the curators of the following herbaria: F, GH, LP, and US for the loan of specimens. We also thank Víctor H. Calvetti for inking our 34 AMAT, A. 1983. Taxones de Compuestas bonaerenses críticos para la investigación farmacológica. Acta Farmaceútica Bonaerense 2(1): 23-36. AMAT, A. 1988. El uso de caracteres Freire et al. histofoliares en la identificación de las especies argentinas del género Achyrocline DC. (Asteraceae). Acta Farmaceútica Bonaerense 7(2): 75-83. ARIZA ESPINAR, L. 1973. Las especies de Baccharis (Compositae) de Argentina central. Boletín de la Academia Nacional de Ciencias 50(1-4): 175-305. BAGGIO, C. H., C. S. FREITAS, L. RIECK & M. C. A. MARQUES. 2003. 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J. MARTÍN. 2003. Antiulcer and antidiarrhoeic effect of Baccharis teindalensis. Pharmaceutica Biology 41: 405-411. VOLKENS, G. 1890. Über Pflanzen mit lackirten Blättern. Mitt. Berichte der deutschen Botanischen. Ges. 8: 120-140. ZARDINI, E. M. 1984. Etnobotánica de compuestas argentinas con especial referencia a su uso farmacológico (primera parte). Acta Farmaceútica Bonaerense 3(1): 77-99. ZIN, J. 1922. La salud por medio de las plantas medicinales. Tercera edición. Escuela Tipográfica “La Gratitud Nacional”. Santiago de Chile. Recibido: 22/09/2006 Aceptado: 18/04/2007 Freire et al. Appendix 1. Baccharis species used in traditional medicine A-C: Leaves. A, B. anomala; B, B. boliviensis; C, B. artemisioides; D, E: Stems. D, B. articulata; E, B. crispa; F-J: Leaves. F, B. decussata; G, B. conferta; H, B. coridifolia; I, B. dracunculifolia; J, B. douglasii; K, L: Stems. K, B. gaudichaudiana; L, B. genistelloides; M-T: Leaves. M, B. genistifolia; N, B. grisebachii; O, B. heterophylla; P, B. illinita; Q, B. tola; R, B. latifolia; S, B. linearis; T, B. megapotamica; U: Stem. B. microcephala; V-h: Leaves. V, B. tricuneata; W, B. multiflora; X, B. nitida; Y. B. notosergila; Z, B. odorata; a, B. pentlandii; b, B. pilularis; c, B. pedunculata; d, B. salicifolia; e, B. sarothroides; f, B. scandens; g, B. serrifolia; h, B. teindalensis; i: Stem. B. trimera; j,k: Leaves. j, B. trinervis; k, B. vaccinioides; l, B. wrightii. 37 Medicinal Baccharis Appendix 2. Representative specimens examined of Baccharis (one specimen per species is cited). Baccharis anomala. BRASIL. Santa Catarina: Capinzal, Smith et Klein 11917 (LP). B. artemisioides. ARGENTINA. Buenos Aires: Pedro Luro, Cabrera 4514 (LP). B. articulata. ARGENTINA. Buenos Aires: Elizalde, Cabrera 1799 (LP). B. boliviensis. ARGENTINA. Jujuy: Yavi, Quebrada del Lecho, Tolaba et al. 1591 (LP). B. conferta. MEXICO. Distrito Federal: Cañada de Contreras, Hernández 1 (LP). B. coridifolia. ARGENTINA. Buenos Aires: San Nicolás, Cabrera 7161 (LP). B. crispa. ARGENTINA. Córdoba: Tulumba, San Pedro Norte (Chico), Luti 4148 (LP). B. decussata. COLOMBIA. Cundinamarca: Pacho-Paime, Haught 6060 (LP). B. douglasii. UNITED STATES. California: Orange County, Raven 16861 (GH). B. dracunculifolia. ARGENTINA. Jujuy: Valle Grande, Cabrera & Fabris 22678 (LP). B. gaudichaudiana. ARGENTINA. Misiones: Apóstoles, Cabrera et al. 28469 (LP). B. genistelloides. PERU. Amazonas: Chachapoyas, Wurdack 497 (LP). B. genistifolia. ARGENTINA. Buenos Aires, Necochea, Cabrera 1289 (LP). B. grisebachii. ARGENTINA. Jujuy: Humahuaca, Kiesling et al 614 (LP). B. heterophylla. MEXICO. Michoacan: Lack Patzcuaro, T. C. Frye & E. M. Frye 2593 (GH). B. illinita. BRASIL. Rio Grande do Sul: Criuva-San Francisco de Paula: Arroio das Muladas, Irmão Edẽsio 121 (LP). B. latifolia. ARGENTINA. Salta: Los Yacones, Zardini 1197 (LP). B. linearis. ARGENTINA. Río Negro: Bariloche, Cabrera 5827 (LP). B. megapotamica. PARAGUAY. Caaguazú: Caaguazú, Schinini 9140 (LP). B. microcephala. ARGENTINA. Misiones: Posadas, Ekman 213 (LP). B. multiflora. MEXICO. Guerrero: Near Chilpancingo, Nelson 2205 (GH). B. nitida. PERU. Amazonas: Leimebamba. Sagástegui 7448 (LP). B. notosergila. ARGENTINA. Buenos Aires: Bavio, Zardini 593 (LP). B. odorata. PERU. Áncash: Bolognesi, Rumipuquio, Cerrate et al. 6508 (LP). B. pedunculata. NICARAGUA. Jinotega: Between Matagalpa and Jinotega, Stevens & Krukoff 10074 (F). B. pentlandii. BOLIVIA. La Paz: Miraflores, Buchtien 8592 (LP). B. pilularis. UNITED STATES. California: Marin County, Solbrig 1927 (LP). B. salicifolia. ARGENTINA. Corrientes: Gral. Paz, Rincón de Vences, Pedersen 6983 (LP). B. sarothroides. MEXICO. Sonora: Nacore Chico, Muller 3693 (GH). B. scandens. ARGENTINA. San Juan: Iglesia, Cerro Antecristo, Kiesling et al. 9164 (LP). B. serrifolia. GUATEMALA. Alta Verapaz, Hunnewell 17272 (GH). B. teindalensis. COLOMBIA. Nariño: Macizo del volcán Galeras, Cuatrecasas & Mora 26940 (US). B. tola. ARGENTINA. Jujuy: Tumbaya, Trancas, Cabrera et al. 22513 (LP). B. tricuneata. COLOMBIA. Antioquia: Santa Helena, Astrágala 25 (LP). B. trimera. ARGENTINA. Buenos Aires: La Plata, Cabrera 464 (LP). B. trinervis. ARGENTINA. Jujuy: Ledesma, Valle Grande, Cabrera et al. 14516 (LP). B. vaccinioides. MEXICO. Chiapas: San Critóbal de Las Casas, Méndez Ton & López 9546 (GH). B. wrightii. MEXICO. Chihuahua: Valley Ortiz, Pringle 1658 (LP). 38