Thalictrum clavatum

Roots few, blackish, filiform or somewhat tuberous. Stems erect, not scapose, 15-50(-60) cm, glabrous. Leaves basal and cauline; proximal cauline leaves petiolate, 2-3×-ternately compound; distal cauline leaves sessile or short-petiolate, 2×-ternately compound or simple. Leaf blade: leaflets reniform to obovate, apically 4-7-lobed, 10-30 mm wide, lobe margins crenate, surfaces abaxially glaucous. Inflorescences panicles or nearly corymbs, few flowered. Flowers: pedicels very slender, elongate; sepals white, obovate-spatulate, 2.5-4 mm; filaments white, 2.5-4 mm; anthers 0.3-0.5 mm. Achenes 3-8, spreading; stipe 1-3(-4) mm, usually ± 1/2 as long (sometimes nearly as long) as achene body; body flat, falcate, 3-5 mm, abaxially convex, adaxially concave, conspicuously 3-veined on each face; beak minute.

Flowering spring-summer (May-Jul). Rich moist woods, cliffs, seepage slopes, and mountain streams in mountains and piedmont; 500 m; Ga., Ky., N.C., S.C., Tenn., Va., W.Va.

Stem 3-7 dm, from a cluster of thickened roots, often little exceeding the basal lf; lfls 2-3 cm long and wide, pale beneath; panicle widely branched, few-fld, with elongate, slender pedicels; fls perfect; filaments white, generally more than 3 mm, strongly dilated above; anthers minute; achenes falcate, concave on the upper margin, strongly convex on the lower, 4-5.5 mm, conspicuously 3-nerved on each face; stipe 1.5-3 mm. Moist woods and cliffs in and near the mts.; Va. and W.Va. to e. Ky., s. to S.C. and Ga. May-July.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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