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Published In: Bulletin de la Société Royale de Botanique de Belgique 89: 319. 1957. (Jun 1957) (Bull. Soc. Roy. Bot. Belgique) Name publication detail

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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4. Thalictrum thalictroides (L.) A.J. Eames & B. Boivín (rue-anemone)

Anemonella thalictroides (L.) Spach

Pl. 512 h, i; Map 2389

Plants lacking rhizomes, the roots swollen and tuberous. Stems 8–25 cm long. Stem leaves (technically bracts) opposite or rarely in a whorl of 3 at a single node immediately subtending the inflorescence (note that in some cases the leaflets may resemble a whorl of six simple leaves), sessile, once ternately compound (the basal leaves twice ternately compound), the largest leaflets 0.8–2.5 cm long, wider than long to about as long as wide, broadly ovate to obovate, broadly oblong, or nearly circular, 3(5)-lobed, the lobes rounded or broadly and bluntly pointed at the tips, relatively thin and membranous in texture, the margins entire or occasionally scalloped, sometimes slightly thickened or inconspicuously revolute (the curled-under portion 0.05–0.10 mm wide), the undersurface and stalk glabrous and lacking sessile glands, the minor veins not noticeably raised from the surface. Inflorescences umbels of 3–6 flowers or solitary flowers, the stalks glabrous. Flowers all perfect. Sepals 5–7, 5–13 mm long, white or sometimes pale pink to purple, rarely green. Filaments yellow to greenish yellow. Fruits 4–5 mm long, narrowly ellipsoid to narrowly ovoid, not appearing stalked, beakless. March–June.

Scattered to common nearly throughout the state, but uncommon or apparently absent from most of the western half of the Glaciated Plains Division (eastern U.S. west to Minnesota and Texas; Canada). Mesic to dry upland forests, bases, ledges, and tops of bluffs, margins of glades, and occasionally banks of streams, also roadsides.

Plants from Polk County with green, leaflike sepals have been called Anemonella thalictroides f. chlorantha Fassett and plants from Putnam County with all of the stamens and pistils transformed into petaloid structures have been called A. thalictroides f. favilliana Bergseng. Thalictrum thalictroides is superficially very similar to Isopyrum biternatum, and the two are often confused. Differences are discussed under that species.



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