Thalictrum alpinum |
Thalictrum debile |
|
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alpine meadow-rue, arctic meadow-rue, dwarf meadow-rue, pigamon alpin |
southern meadow-rue |
|
Roots | brownish, fusiform-tuberous with dried ribs. |
|
Stems | erect, scapose, or nearly scapose with very slender rhizomes, (3-)5-20(-30) cm, glabrous. |
reclining, branched and flexible proximally, 10-40 cm, glabrous. |
Leaves | blade 2x-pinnately compound, proximal primary divisions ternate; leaflets cuneate-obovate to orbiculate, apically 3-5-lobed, 2-10 mm, surfaces glabrous. |
blade: leaflets ovate or obovate to reniform or orbiculate, apically shallowly to deeply 3-7-lobed, rarely undivided, 4-15 mm wide, surfaces glabrous. |
Inflorescences | racemes, usually elongate, few flowered. |
terminal and axillary, panicles, elongate, few flowered. |
Flowers | 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. |
sepals whitish, lanceolate to obovate, 1.5-2.7 mm; filaments colored, not white, 1.5-2 mm; anthers 1.7-2.5 mm, mucronate; stigma color unknown. |
Achenes | 2-6, nearly sessile; body lance-obovoid, 2-3.5 mm, with thick veins. |
1-6, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body oblong to elliptic-lanceolate, not compressed, 3-3.7 × 0.7-1.2 mm, glabrous, prominently 6-8-veined, veins not anastomosing; beak 1.3-2 mm. |
2n | = 14, 21. |
|
Thalictrum alpinum |
Thalictrum debile |
|
Phenology | Flowering late spring–summer (Jun–Aug). | Flowering in early spring (Mar–Apr). |
Habitat | Wet meadows, damp rocky ledges and slopes, and cold (often calcareous) bogs in willow-sedge, lodgepole pine, and spruce-fir | Rich, rocky, limestone woods, often in wet, alluvial soil |
Elevation | 0-3800 m (0-12500 ft) | 50-300 m (200-1000 ft) |
Distribution |
AK; CA; CO; ID; MT; NM; NV; OR; UT; WY; BC; NF; NT; QC; YT; Greenland; n Eurasia
|
AL; GA; MS |
Discussion | Of conservation concern. Thalictrum debile is closely related to T. arkansanum and T. texanum. The distinctions among the three species should be further studied. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Thalictrum > sect. Thalictrum | Ranunculaceae > Thalictrum > sect. Heterogamia |
Sibling taxa | ||
Synonyms | T. alpinum var. hebetum | |
Name authority | Linnaeus: Sp. Pl. 1: 545. (1753) | Buckley: Amer. J. Sci. Arts 45: 175. (1843) |
Web links |