Thalictrum venulosum |
Thalictrum alpinum |
|
---|---|---|
early meadow-rue, veiny meadow-rue, veiny-leaf meadow-rue |
alpine meadow-rue, arctic meadow-rue, dwarf meadow-rue, pigamon alpin |
|
Stems | erect, 20-50 cm, glabrous, from rhizomes. |
erect, scapose, or nearly scapose with very slender rhizomes, (3-)5-20(-30) cm, glabrous. |
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 2x-pinnately compound, proximal primary divisions ternate; leaflets cuneate-obovate to orbiculate, apically 3-5-lobed, 2-10 mm, surfaces glabrous. |
Inflorescences | terminal, panicles, narrow and dense, many flowered. |
racemes, usually elongate, few 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. |
pedicels recurved in fruit; sepals early deciduous, purplish tinged, ovate or elliptic, 1-2.3(-2.7) mm; stamens 8-15; filaments purple; anthers bright yellow, 1.5-3 mm; stigmas 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. |
2-6, nearly sessile; body lance-obovoid, 2-3.5 mm, with thick veins. |
2n | = 14, 21. |
|
Thalictrum venulosum |
Thalictrum alpinum |
|
Phenology | Flowering early summer-mid summer (Jun–Aug). | Flowering late spring–summer (Jun–Aug). |
Habitat | Prairies, riparian woods, and coniferous, deciduous, and mixed forests | Wet meadows, damp rocky ledges and slopes, and cold (often calcareous) bogs in willow-sedge, lodgepole pine, and spruce-fir |
Elevation | 600-3700 m (2000-12100 ft) | 0-3800 m (0-12500 ft) |
Distribution |
CO; ID; MN; MT; ND; NE; NM; NV; OR; SD; UT; WA; WI; WY; AB; BC; MB; NT; ON; QC; SK; YT
|
AK; CA; CO; ID; MT; NM; NV; OR; UT; WY; BC; NF; NT; QC; YT; Greenland; n Eurasia
|
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. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Thalictrum > sect. Heterogamia | Ranunculaceae > Thalictrum > sect. Thalictrum |
Sibling taxa | ||
Synonyms | T. alpinum var. hebetum | |
Name authority | Trelease: Proc. Boston Soc. Nat. Hist. 23: 302. (1886) | Linnaeus: Sp. Pl. 1: 545. (1753) |
Web links |