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Published In: Index Seminum [St. Petersburg] 8: 72. 1842. (Index Seminum (St. Petersburg)) 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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1. Thalictrum dasycarpum Fisch. & Avé-Lall. (purple meadow-rue)

T. dasycarpum var. hypoglaucum (Rydb.) B. Boivin

Pl. 516 d; Map 2386

Plants dioecious (rarely with a few perfect flowers), with rhizomes and slender, nontuberous roots. Stems 60–150(–200) cm long. Stem leaves alternate at few to several nodes; the lower leaves petiolate, the upper leaves sessile or nearly so; well-developed lower leaves 3 times ternately or ternately-pinnately compound, the largest leaflets 1.5–5.5 cm long, mostly longer than wide, oblong to obovate or oblanceolate, unlobed or 3(–7)-lobed, the lobes rounded to more commonly angled or tapered to bluntly or sharply pointed tips, papery or rather stiff in texture, the margins entire or occasionally scalloped, narrowly revolute (the curled-under portion 0.07–0.16 mm wide), the undersurface and stalk glabrous or pubescent with nonglandular hairs, sometimes also with sessile glands, the minor veins somewhat raised from the surface. Inflorescences panicles, their branches glabrous or pubescent with nonglandular hairs, sometimes also with sessile glands. Flowers all or nearly all imperfect. Sepals 4, 2–3 mm long, white or sometimes pale pinkish- to purplish-tinged. Filaments white or purplish-tinged. Fruits 3–5 mm long, flattened-ellipsoid, not appearing stalked, the beak 3–4 mm long, becoming brittle with age and often shed, the surface glabrous or pubescent with nonglandular hairs, sometimes also with inconspicuous sessile glands. May–July.

Scattered in the northern and western halves of the state, but uncommon or absent from most of the southeastern quarter (nearly throughout the U.S. except for some far-eastern and far-western states; Canada). Banks of streams, rivers, and oxbows, bases of bluffs, bottomland forests, and openings and edges of mesic upland forests; also old fields, fencerows, ditches, railroads, and roadsides.

Glabrous forms of this species have been called var. hypoglaucum. They do not differ from typical plants in any other way and both forms are sometimes found in the same population, so it seems best not to assign a formal name to this variant. These glabrous plants are very difficult to distinguish from glabrous forms of T. revolutum (see further discussion under that species).

 


 

 
 
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