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early meadow-rue, pigamon dioïque, quicksilver-weed

maid of the mist

Roots

yellow to light brown, fibrous, from stout caudex.

bright yellow, tuberous.

Stems

erect, 30-80 cm, glabrous or glandular.

erect, coarse, 65-150 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 1-4x-ternately compound;

leaflets reniform or obovate to orbiculate, apically 3-9-lobed or toothed, 10-75 mm wide, lobe margins crenate, surfaces abaxially glabrous or glandular.

Inflorescences

terminal and axillary, panicles to corymbs, many flowered.

panicles, pyramidal, loosely branched, many 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 white to purplish, lanceolate-ovate, 1.5-5.5 mm;

filaments maroon, 4-4.5 mm;

anthers 2-5.5 mm, apiculate, subulate-tipped;

stigma maroon.

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.

3-15, erect, not reflexed, stipitate;

stipe ± wing-angled, 0.7-2.5 mm;

body obliquely ovoid to ellipsoid, not laterally compressed, 3-6.5 mm, strongly veined or ribbed, veins not anastomosing;

beak 1.5-3 mm.

Thalictrum dioicum

Thalictrum coriaceum

Phenology Flowering spring (Apr–Jun). Flowering mid spring–late spring (late May–Jun).
Habitat Rocky woods, ravines, and alluvial terraces, mountains and piedmont Rocky or mesic, open, deciduous woods, thickets, and moist alluvium, chiefly in mountains and piedmont
Elevation 10-1000 m (0-3300 ft) 3-1100 m (0-3600 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
DC; KY; MD; NC; PA; TN; VA; WV
[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.)

Glandular plants of Thalictrum coriaceum have often been misidentified as T. revolutum despite important differences in the leaflets, the latter having entire rather than crenate lobe margins.

Studies by M. Park and L. Morse (unpubl.) for The Nature Conservancy confirmed that Thalictrum steeleanum is highly variable in all allegedly diagnostic characters and is not distinct from T. coriaceum.

(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. arkansanum, T. clavatum, T. confine, T. cooleyi, 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. dioicum var. coriaceum, T. caulophylloides, T. steeleanum
Name authority Linnaeus: Sp. Pl. 1: 545. (1753) (Britton) Small: Mem. Torrey Bot. Club 4: 98. (1893)
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