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(Last Modified On 2/7/2013)
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(Last Modified On 2/7/2013)
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Genus
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CLEMATIS L.
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PlaceOfPublication
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Sp. P1. 543. 1753.
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Synonym
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Atragene L. I.c. 1753. Muralta Adans. Fam. 2: 460. 1763. Viticella Dill. ex Moench, Meth. 296. 1794. Naravelia DC. Syst. 1: 167. 1818. Viorna Reichb. Handb. 227. 1837. Cheiropsis Spach, Hist. Veg. Phan. 7: 260. 1839. Meclatis Spach, loc. cit. 272. 1839. Sieboldia Hoffmgg. ex Heynh. Nom. 2: 665. 1846.
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Description
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Dioecious or polygamo-monoecious, lignescent vines, climbing by means of foliar tendrils (in Central America). Leaves opposite, exstipulate, ternately, pin- nately or biternately compound, the leaflets entire to coarsely dentate, often asymmetrical, 1- to 5-plinerved, glabrous to densely sericeous, the rhachis usually pubescent, often twining. Inflorescences of cymes or umbels racemosely disposed along the bracteate, often elongate main axis, unisexual or polygamous; sepals 4-5, valvate, white, greenish or purplish, often petaloid; stamens numerous, sepa- rate, the filaments flattened and elongate, the anthers basifixed, 2-celled, longi- tudinally dehiscent; carpels numerous, separate, the styles comose. Fruit a dry arcuate-ellipsoid achene terminated by the elongate indurate, hirsute style, the ovule pendulous on the dorsal raphe.
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Habit
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vines
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Note
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Several ornamentals exist in this widespread temperate and tropical genus of both hemispheres. Only the monographer could say how many species there are; the first volume of the Index Kewensis devoted seven and a half columns to the genus. Extreme variability in the leaves, indument and sexuality have resulted in a rapid increment of named species, many of which, at best, deserve only formal status. The South American species recently have been treated by Lour- teig (in Darwiniana 9: 397. 1951, and in Mem. Soc. Cien. Nat. La Salle 16: 19. 1956). Three elements occur in Panama, and I am handling them in the status which I believe would have been assigned them by Lourteig, although the dif- ferences between them are by no means constant.
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Key
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a. Leaflets densely sericeous, coarsely dentate with 2-6 teeth per side, often basally cordate ..................................1. C. HAENKEANA aa. Leaflets glabrescent, entire or with fewer teeth, basally rounded or truncate ..2. C. DIOICA
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