Thalictrum dioicum |
Thalictrum alpinum |
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early meadow-rue, pigamon dioïque, quicksilver-weed |
alpine meadow-rue, arctic meadow-rue, dwarf meadow-rue, pigamon alpin |
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Roots | yellow to light brown, fibrous, from stout caudex. |
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Stems | erect, 30-80 cm, glabrous or glandular. |
erect, scapose, or nearly scapose with very slender rhizomes, (3-)5-20(-30) cm, glabrous. |
Leaves | 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. |
blade 2x-pinnately compound, proximal primary divisions ternate; leaflets cuneate-obovate to orbiculate, apically 3-5-lobed, 2-10 mm, surfaces glabrous. |
Inflorescences | terminal and axillary, panicles to corymbs, many flowered. |
racemes, usually elongate, few flowered. |
Flowers | 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. |
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 | (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. |
2-6, nearly sessile; body lance-obovoid, 2-3.5 mm, with thick veins. |
2n | = 14, 21. |
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Thalictrum dioicum |
Thalictrum alpinum |
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Phenology | Flowering spring (Apr–Jun). | Flowering late spring–summer (Jun–Aug). |
Habitat | Rocky woods, ravines, and alluvial terraces, mountains and piedmont | Wet meadows, damp rocky ledges and slopes, and cold (often calcareous) bogs in willow-sedge, lodgepole pine, and spruce-fir |
Elevation | 10-1000 m (0-3300 ft) | 0-3800 m (0-12500 ft) |
Distribution |
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
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AK; CA; CO; ID; MT; NM; NV; OR; UT; WY; BC; NF; NT; QC; YT; Greenland; n Eurasia
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Discussion | 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.) |
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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 | Linnaeus: Sp. Pl. 1: 545. (1753) | Linnaeus: Sp. Pl. 1: 545. (1753) |
Web links |