Thalictrum clavatum |
Thalictrum arkansanum |
|
---|---|---|
mountain meadow-rue |
Arkansas meadow-rue |
|
Roots | few, blackish, filiform or somewhat tuberous. |
brown, thick, tuberous. |
Stems | erect, not scapose, 15-50(-60) cm, glabrous. |
decumbent, 20-40 cm, glabrous. |
Leaves | blade: leaflets reniform to obovate, apically 4-7-lobed, 10-30 mm wide, lobe margins crenate, surfaces abaxially glaucous. |
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 | panicles or nearly corymbs, few flowered. |
terminal, racemes, few flowered. |
Flowers | pedicels very slender, elongate; sepals white, obovate-spatulate, 2.5-4 mm; filaments white, 2.5-4 mm; anthers 0.3-0.5 mm. |
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 | 3-8, spreading; stipe 1-3(-4) mm, usually ± 1/2 as long (sometimes nearly as long) as achene body; body flat, falcate, 3-5 mm, abaxially convex, adaxially concave, conspicuously 3-veined on each face; beak minute. |
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 clavatum |
Thalictrum arkansanum |
|
Phenology | Flowering spring–summer (May–Jul). | Flowering early spring (Mar–Apr). |
Habitat | Rich moist woods, cliffs, seepage slopes, and mountain streams in mountains and piedmont | Wet bottomland forest, sometimes upland woods |
Elevation | 500 m (1600 ft) | 20-150 m (100-500 ft) |
Distribution |
GA; KY; NC; SC; TN; VA; WV
|
AR; OK; TX |
Discussion | 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. Physocarpum | Ranunculaceae > Thalictrum > sect. Heterogamia |
Sibling taxa | ||
Synonyms | T. filipes, T. nudicaule | |
Name authority | de Candolle: Syst. Nat. 1: 171. (1817) | B. Boivin: Rhodora 46: 433. (1944) |
Web links |