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early meadow-rue, pigamon dioïque, quicksilver-weed

mountain meadow-rue

Roots

yellow to light brown, fibrous, from stout caudex.

few, blackish, filiform or somewhat tuberous.

Stems

erect, 30-80 cm, glabrous or glandular.

erect, not scapose, 15-50(-60) 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: leaflets reniform to obovate, apically 4-7-lobed, 10-30 mm wide, lobe margins crenate, surfaces abaxially glaucous.

Inflorescences

terminal and axillary, panicles to corymbs, many flowered.

panicles or nearly corymbs, 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 very slender, elongate;

sepals white, obovate-spatulate, 2.5-4 mm;

filaments white, 2.5-4 mm;

anthers 0.3-0.5 mm.

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.

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.

Thalictrum dioicum

Thalictrum clavatum

Phenology Flowering spring (Apr–Jun). Flowering spring–summer (May–Jul).
Habitat Rocky woods, ravines, and alluvial terraces, mountains and piedmont Rich moist woods, cliffs, seepage slopes, and mountain streams in mountains and piedmont
Elevation 10-1000 m (0-3300 ft) 500 m (1600 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
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[BONAP county map]
from FNA
GA; KY; NC; SC; TN; VA; WV
[WildflowerSearch map]
[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.)

Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Thalictrum > sect. Heterogamia Ranunculaceae > Thalictrum > sect. Physocarpum
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. arkansanum, 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
Synonyms T. filipes, T. nudicaule
Name authority Linnaeus: Sp. Pl. 1: 545. (1753) de Candolle: Syst. Nat. 1: 171. (1817)
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