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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
from FNA
GA; KY; NC; SC; TN; VA; WV
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; OK; TX
[BONAP county map]
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
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
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
Synonyms T. filipes, T. nudicaule
Name authority de Candolle: Syst. Nat. 1: 171. (1817) B. Boivin: Rhodora 46: 433. (1944)
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