Thalictrum dioicum |
Thalictrum arkansanum |
|
---|---|---|
early meadow-rue, pigamon dioïque, quicksilver-weed |
Arkansas meadow-rue |
|
Roots | yellow to light brown, fibrous, from stout caudex. |
brown, thick, tuberous. |
Stems | erect, 30-80 cm, glabrous or glandular. |
decumbent, 20-40 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 1-3x-ternately compound; leaflets ovate to obovate to reniform or orbiculate, 3-(or more)-lobed, largest leaflets less than 15 mm wide, lobe margins crenate, surfaces glabrous. |
Inflorescences | terminal and axillary, panicles to corymbs, many flowered. |
terminal, racemes, 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. |
sepals whitish, ovate or elliptic, 0.9-2.8(-3) mm; filaments colored, 2-3 mm; anthers 1.8-2.3 mm, mucronate, tip 0.1-0.4 mm; stigma color unknown. |
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. |
few, not reflexed, nearly sessile; stipe 0.1-0.3 mm; body ellipsoid to oblong, 3.5-4.5 × 1.5-2 mm, glabrous, veins 10-12, not anastomosing-reticulate; beak (1.3-)2.3-3 mm. |
Thalictrum dioicum |
Thalictrum arkansanum |
|
Phenology | Flowering spring (Apr–Jun). | Flowering early spring (Mar–Apr). |
Habitat | Rocky woods, ravines, and alluvial terraces, mountains and piedmont | Wet bottomland forest, sometimes upland woods |
Elevation | 10-1000 m (0-3300 ft) | 20-150 m (100-500 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
|
AR; OK; TX |
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.) |
Of conservation concern. Poorly known, Thalictrum arkansanum is closely related to T. texanum and T. debile; it possibly should be considered as a variety of the latter. (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. Heterogamia |
Sibling taxa | ||
Name authority | Linnaeus: Sp. Pl. 1: 545. (1753) | B. Boivin: Rhodora 46: 433. (1944) |
Web links |