E-Flora BC: Electronic Atlas of the Flora of British Columbia

Thalictrum venulosum Trel.
veiny meadowrue (veiny meadow-rue)
Ranunculaceae (Buttercup family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #29624)

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Distribution of Thalictrum venulosum
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Species Information

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Perennial herb from a rhizome; stems erect, 20-70 cm tall, smooth.
Stem leaves 1 to 3, alternate, the basal and lower stem leaves stalked, 3- to 4-times 3-parted, the leaflets thick, circular to egg-shaped, 5-20 mm long, the tips 3- to 5-lobed, the lobes round-toothed, prominently veined and smooth or glandular-hairy below; stem leaves subtending panicle branches unstalked.
Inflorescence a many-flowered, narrow, terminal raceme, the bracts small, the flowers unisexual, male and female flowers on separate plants; flower stalks ascending; petals absent; sepals 4 (-6), greenish-white, lanceolate to broadly egg-shaped or elliptic, 2-4 mm long; stamens 10-20, the filaments coloured, not white, threadlike, 3-5.5 mm long, the anthers 2-3.5 mm long, blunt to pointy-tipped; stigmas usually yellowish.
Achenes, 5-17, erect to spreading, curved, elliptic-oblong, 3-4 mm long, round to slightly flattened, smooth to glandular, distinctly longitudinally veined, stalks 0.1-0.3 mm long; beaks 1.5-2.5 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic meadows, grassy slopes, thickets and open forests in the steppe and montane zones; frequent in BC east of Coast-Cascade Mountains; N to YT and NT, E to PQ and S to MN, WI, SD, WY and OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Thalictrum venulosum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 400 1536 2280
Slope Gradient (%) 0 25 90
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
4 106 340
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 4 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: AT(4), BAFA(1), BWBS(9), ESSF(48), ICH(11), IDF(6), MS(28), SBS(6)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Thalictrum columbianum
Thalictrum confine Fern.
Thalictrum confine var. columbianum (Rydb.) B. Boivin
Thalictrum confine var. greeneanum Boivin
Thalictrum occidentale var. columbianum (Rydb.) M. Peck
Thalictrum turneri B. Boivin
Thalictrum venulosum var. confine (Fern.) Boivin
Thalictrum venulosum var. fissum (Greene) Boivin
Thalictrum venulosum var. lunellii (Greene) Boivin
Thalictrum venulosum var. turneri (Boivin) Boivin
Thalictrum venulosum var. venulosum

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References