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Published In: Species Plantarum 1: 545–546. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 9/8/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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2. Thalictrum dioicum L. (early meadow-rue, quicksilver weed)

Pl. 516 i; Map 2387

Plants dioecious, with short rhizomes and more or less slender, nontuberous roots. Stems 30–70 cm long. Stem leaves alternate at few to several nodes; all noticeably petiolate; well-developed lower leaves 3 or 4 times ternately or ternately-pinnately compound, the largest leaflets 1.5–2.8 cm long, shorter than to slightly longer than wide, broadly elliptic to obovate, kidney-shaped, broadly heart-shaped, or nearly circular, 3–7-lobed, the lobes rounded to truncate, relatively thin and membranous in texture, the margins entire or more commonly scalloped, sometimes slightly thickened or inconspicuously revolute (the curled-under portion 0.05–0.10 mm wide), the undersurface and stalk glabrous or with inconspicuous sessile glands, the minor veins not raised from the surface. Inflorescences panicles, their branches glabrous or with inconspicuous sessile glands. Flowers imperfect. Sepals 4, 3–5 mm long, green or purple. Filaments yellow to greenish yellow. Fruits 3–4 mm long, narrowly ellipsoid, sometimes appearing short-stalked, the beak 1.5–2.0 mm long, often shed except for a minute, peglike base, the surface glabrous or with inconspicuous sessile glands. April–May.

Scattered, mostly south of the Missouri River (eastern U.S. west to North Dakota and Oklahoma; Canada). Bases, ledges, and tops of bluffs, mesic upland forests, and banks of streams and rivers.



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