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

Stems

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

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.

Inflorescences

terminal, panicles, narrow and dense, 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.

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.

Thalictrum venulosum

Phenology Flowering early summer-mid summer (Jun–Aug).
Habitat Prairies, riparian woods, and coniferous, deciduous, and mixed forests
Elevation 600-3700 m (2000-12100 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
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[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.)

Source FNA vol. 3.
Parent taxa 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
Name authority Trelease: Proc. Boston Soc. Nat. Hist. 23: 302. (1886)
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