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early meadow-rue, veiny meadow-rue, veiny-leaf meadow-rue

early meadow-rue, pigamon dioïque, quicksilver-weed

Roots

yellow to light brown, fibrous, from stout caudex.

Stems

erect, 20-50 cm, glabrous, from rhizomes.

erect, 30-80 cm, glabrous or glandular.

Leaves

blade 3-4x-ternately compound;

leaflets obovate to orbiculate, apically 3-5-lobed, 5-20 mm, lobe margins crenate, surfaces abaxially glabrous or glandular-puberulent.

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, panicles, narrow and dense, many flowered.

terminal and axillary, panicles to corymbs, many flowered.

Flowers

sepals greenish white, lanceolate or broadly ovate to elliptic or obovate, 2-4 mm;

filaments colored, not white, (1.8-)3-5.5 mm;

anthers 2-3.5 mm, blunt to mucronate;

stigma commonly yellowish.

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.

Achenes

5-17, erect to spreading, not reflexed, nearly sessile;

stipe 0.1-0.3 mm;

body often distinctly curved, elliptic-oblong, nearly terete to slightly flattened, adaxial surface 3-4(-6) mm, glabrous to glandular, veins distinct, not anastomosing-reticulate;

beak 1.5-2.5(-3) mm.

(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.

Thalictrum venulosum

Thalictrum dioicum

Phenology Flowering early summer-mid summer (Jun–Aug). Flowering spring (Apr–Jun).
Habitat Prairies, riparian woods, and coniferous, deciduous, and mixed forests Rocky woods, ravines, and alluvial terraces, mountains and piedmont
Elevation 600-3700 m (2000-12100 ft) 10-1000 m (0-3300 ft)
Distribution
from FNA
CO; ID; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WI; WY; AB; BC; MB; NT; ON; QC; SK; YT
[WildflowerSearch map]
[BONAP county map]
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
[WildflowerSearch map]
[BONAP county map]
Discussion

Thalctrum venulosum is similar to T. confine and T. occidentale. Careful field studies are needed to clarify the relationships among these taxa.

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

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.)

Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Thalictrum > sect. Heterogamia Ranunculaceae > Thalictrum > sect. Heterogamia
Sibling taxa
T. alpinum, T. amphibolum, T. arkansanum, T. clavatum, T. confine, T. cooleyi, T. coriaceum, T. dasycarpum, T. debile, T. dioicum, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. mirabile, T. occidentale, T. polycarpum, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides
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
Name authority Trelease: Proc. Boston Soc. Nat. Hist. 23: 302. (1886) Linnaeus: Sp. Pl. 1: 545. (1753)
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