(Last Modified On 6/20/2013)
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(Last Modified On 6/20/2013)
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Genus
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Onoseris Willd.
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PlaceOfPublication
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Sp. P1. 3: 1702. 1804.
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Note
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TYPE: 0. purpurea (L.f.) Blake.
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Synonym
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Seris Willd., Ges. Naturf. Freunde Berlin Mag. Neuesten Entdeck. Gesammten Naturk. 1: 139. 1807. TYPE: S. onoseroides (H.B.K.)Willd. ex Spreng. Hipposeris Cass., Dict. Sci. Nat. 33: 464. 1824. TYPE: No valid combination made. Jackson, Index Kew. 2: 1164 (1894) makes a combination, H. salicifolia, but as a synonym of Onoseris salicifolia H.B.K. Centroclinium D. Don, Trans. Linn. Soc. 16: 254. 1830. TYPE: C. albicans D. Don. Caloseris Benth., P1. Hartw. 88. 1841. TYPE: C. rupestris Benth. Cladoseris Spach, Hist. Nat. Veg. 10: 35. 1841. TYPE: C. annua (Less.) Spach. Cursonia Nutt., Trans. Amer. Philos. Soc., n.s. 7: 422. 1841. TYPE: C. peruviana Nutt. Schaetzellia Klotzsch, Allg. Gartenzeitung 17: 82. 1849. TYPE: S. deckeri Klotzsch. Rhodoseris Turcz., Bull. Soc. Imp. Naturalistes Moscou 24: 38, tab. 2. 1851. TYPE: R. conspicua Turcz. Cataleuca Koch & Fintelm., Wochenschr. Gartnerei Pflanzenk. 2: 163. 1859, nom. nud. TYPE: C. rubicunda Koch & Fintelm, substitute name for Isotypus onoseroides H.B.K. Pereziopsis Coult., Bot. Gaz. (Crawfordsville) 20: 52, pl. 6. 1895. TYPE: P. Donnell-Smithii Coult.
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Description
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Shrubs (annual herbs) with ribbed, (smooth) white or gray lanate stems. Leaves alternate, variable in size, usually deeply parted, slightly lanate above, densely lanate beneath, petiolate or sessile; petiole, if present, alate, lobulose, or both in most species. Inflorescences loosely paniculate or of solitary heads. Heads either discoid (in Panama) or disciform, turbinate; involucral bracts in several series, ovate to lanceolate, lanate or variously pubescent on the outer surface; receptacle flat, fimbrillate, pilose or naked; in disciform heads the outer series of florets with a strap-shaped ligule and 2 minute inner teeth, the inner series either actinomorphic, tubular, 5-dentate, or slightly zygomorphic with 1 segment larger than the other 4; in discoid heads, the florets all fertile, zygomorphic, with 1 of the 5 corolla lobes expanded, the anthers with sagittate basal appendages, acute or with spreading hairs at the tip, the style claviform or cylindrical. Achenes more or less terete, ribbed, the ribs glabrous or variously pubescent; pappus of abundant yellowish setose bristles.
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Habit
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Shrubs
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Distribution
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The genus Onoseris with about 24 species extends from Mexico to Argentina with a concentration of shrubby species in Central America and the extreme western Andes.
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Note
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The annual species are all restricted to high Andean habitats. Four species occur in Central America and 9 species are endemic to Peru. The genus, usually placed in the Gochnatinae, has species with some characters of this subtribe, e.g., actinomorphic corollas, but other species have zygomorphic corollas, characteristic of the Nassauviinae.
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Reference
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Ferreyra, R. 1944. Revision del genero Onoseris. Jour. Arnold Arbor. 25: 349-395, 9 pts.
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