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early meadow-rue, pigamon dioïque, quicksilver-weed

Roots

yellow to light brown, fibrous, from stout caudex.

Stems

erect, 30-80 cm, glabrous or glandular.

Leaves

blade 1-4x-ternately compound;

leaflets reniform or cordate to obovate or orbiculate, apically 3-12-lobed, 10-45 mm wide, lobe margins often crenate, surfaces abaxially glabrous or glandular.

Inflorescences

terminal and axillary, panicles to corymbs, many flowered.

panicles, racemes, or corymbs.

Flowers

sepals greenish to purple, ovate or obovate to oval, 1.8-4 mm;

filaments yellow to greenish yellow, 3.5-5.5 mm;

anthers 2-4 mm, mucronate to acuminate;

stigma purple.

unisexual (rarely also bisexual in T. debile and T. fendleri);

sepals 4(-6);

filaments filiform (to slightly clavate in T. heliophilum).

Achenes

(3-)7–13, not reflexed, sessile or nearly so;

stipe terete, 0-0.2 mm;

body ovoid to ellipsoid, not laterally compressed, 3.5-5 mm, glabrous, very strongly veined, veins not anastomosing-reticulate;

beak 1.5-3 mm.

sessile to nearly sessile.

Thalictrum dioicum

Thalictrum sect. Heterogamia

Phenology Flowering spring (Apr–Jun).
Habitat Rocky woods, ravines, and alluvial terraces, mountains and piedmont
Elevation 10-1000 m (0-3300 ft)
Distribution
from FNA
AL; CT; DC; GA; IA; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; NC; ND; NE; NH; NJ; NY; OH; PA; RI; SC; SD; TN; VA; VT; WI; WV; MB; ON; QC
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North America; Mexico
Discussion

Glandular plants of Thalictrum dioicum have often been misidentified as T. revolutum despite important differences, especially the leaflets having crenate versus entire lobe margins, respectively. The stamens in both T. dioicum and T. revolutum are pendulous.

Native Americans used roots of Thalictrum dioicum in various preparations to treat diarrhea and vomiting and for heart palpitations (D. E. Moerman 1986).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species 25 (11 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Thalictrum > sect. Heterogamia Ranunculaceae > Thalictrum
Sibling taxa
T. alpinum, T. amphibolum, T. arkansanum, T. clavatum, T. confine, T. cooleyi, T. coriaceum, T. dasycarpum, T. debile, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. mirabile, T. occidentale, T. polycarpum, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides, T. venulosum
Subordinate taxa
Synonyms T. unranked Heterogamia
Name authority Linnaeus: Sp. Pl. 1: 545. (1753) (de Candolle) B. Boivin: Rhodora 46: 432. (1944)
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