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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
from FNA
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
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; OK; TX
[BONAP county map]
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
T. alpinum, T. amphibolum, T. arkansanum, T. clavatum, T. confine, T. cooleyi, T. coriaceum, T. dasycarpum, T. debile, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. mirabile, T. occidentale, T. polycarpum, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides, T. venulosum
T. alpinum, T. amphibolum, T. clavatum, T. confine, T. cooleyi, T. coriaceum, T. dasycarpum, T. debile, T. dioicum, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. mirabile, T. occidentale, T. polycarpum, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides, T. venulosum
Name authority Linnaeus: Sp. Pl. 1: 545. (1753) B. Boivin: Rhodora 46: 433. (1944)
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