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many fruit meadowrue, tall western meadow-rue

little mountain meadow-rue

Roots

fibrous.

Stems

erect, 6-18(-20) dm, glabrous.

weakly erect to reclining, 10-30 cm, glabrous.

Leaves

blade 3-4x-ternately compound;

leaflets orbiculate to obovate, apically 3-cleft or 3-parted, divisions undivided or shallowly 3-lobed, 15-40 mm wide, lobes rounded or somewhat acute, surfaces glabrous or glandular.

blade: basal usually ternately compound, distal gradually less divided;

leaflets nearly orbiculate to orbiculate-reniform, apically 4-7-lobed, 20-30 mm wide, lobe margins crenate, surfaces abaxially glaucescent.

Inflorescences

terminal, panicles, many flowered.

panicles, few flowered.

Flowers

sepals whitish to purplish, elliptic to ovate or lanceolate, 2-4(-5) mm;

filaments whitish to pinkish, 3-6 mm;

anthers (1.4-)2-4 mm, distinctly apiculate.

sepals white, spatulate to rhombic-spatulate, 1.5 mm;

filaments white, 2-3 mm;

anthers 0.3-0.5 mm.

Achenes

10-15, spreading in globose heads, not reflexed, sessile or nearly so;

stipe 0-0.6 mm;

body nearly globose to obovoid to obliquely obovate, laterally compressed, somewhat inflated and papery, 4-7(-8) mm, glabrous to glandular, often with 1 or 2 primary veins on each side, veins sinuous, branched, anastomosing-reticulate;

beak 2-4 mm.

3-8, spreading;

stipe 2.5-3.5 mm, nearly as long as achene body;

body flat, 2.5-4 mm, abaxial margin convex, adaxial margin straight, conspicuously 3-veined on each face;

beak minute.

Thalictrum polycarpum

Thalictrum mirabile

Phenology Flowering mid-late spring (Apr–Jun). Flowering late spring–early summer (Jun).
Habitat Streamsides and other moist places, forests, and open woodlands Moist sandstone bluffs, sinks, and rocky crevices
Elevation 600-3100 m (2000-10200 ft) 200-1500 m (700-4900 ft)
Distribution
from FNA
CA; NV; OR; UT; Mexico (Baja California)
[WildflowerSearch map]
from FNA
AL; GA; KY; NC; TN
[BONAP county map]
Discussion

Thalictrum polycarpum is the only species in sect. Heterogamia with anastomosing-reticulate veins on the achene.

The stems and roots of Thalictrum polycarpum are considered poisonous when ingested by humans or cattle; Native Americans used this species medicinally as a wash for headaches, as an applications for sprains, and as a universal charm and panacea (D. E. Moerman 1986).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Thalictrum mirabile is very similar to T. clavatum. Field studies are in progress to clarify the status of this species.

(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. dioicum, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. mirabile, T. occidentale, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides, T. venulosum
T. alpinum, T. amphibolum, T. arkansanum, T. clavatum, T. confine, T. cooleyi, T. coriaceum, T. dasycarpum, T. debile, T. dioicum, T. fendleri, T. heliophilum, T. macrostylum, T. minus, T. occidentale, T. polycarpum, T. pubescens, T. sparsiflorum, T. texanum, T. thalictroides, T. venulosum
Synonyms T. fendleri var. polycarpum
Name authority (Torrey) S. Watson: Proc. Amer. Acad. Arts 14: 288. (1879) Small: Bull. Torrey Bot. Club 27: 277. (1900)
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