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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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THALICTRUM L.
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PlaceOfPublication
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Sp. P1. 545. 1753.
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Synonym
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Physocarpum Bercht. & Presl, Rostl. 1: 14. 1823. Ruprechtia Opiz, Seznam 86. 1852, nec C. A. Mey. nec Rchb. Sumnera Nieuwl. in Am. Midl. Nat. 3: 254. 1914. Leucocoma (Greene) Nieuwl. loc. cit. 3; 1914.
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Description
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Glabrous to pubescent erect herbaceous or lignescent perennials, occasionally stoloniferous, the roots mostly fibrous, occasionally tuberous. Leaves radical and cauline, the cauline usually alternate, decompound, glabrous to pubescent, with swollen petiolar sheaths. Inflorescences mostly terminal, paniculate or rarely racemose or subcorymbose, bracteate or ebracteate, the flowers perfect, dioecious or polygamous; sepals 4-5(-7), caducous, greenish or petaloid; petals absent; stamens numerous, free, the anthers basifixed, often apiculate; carpels few to many, inde- hiscent, uniovulate. Achenes few to numerous, more or less saccate, often costate or nerved, the elongate styles frequently deciduous.
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Habit
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herb
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Distribution
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Thalictrum is most common in temperate portions of the northern hemisphere, where a few species are handsome enough to be cultivated. In a monograph of the American Thalictra and their Old World allies, Boivin (in Rhodora 46: 337. 1944.) treated 112 species and varieties. Only two species are reported from Panama.
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Reference
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Boivin (in Rhodora 46: 337. 1944.)
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Key
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a. Plants not glaucous, glabrous; carpels 3.0-3.2 mm. broad --------- 1. T. VIRIDULUM aa. Plants glaucous, pubescent with capitate hairs; carpels 2.0-2.2 mm. broad ........... ....2. T. PANAMENSE .
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