Vines woody, sometimes dwarf, erect shrublets when growing in dry, sandy, or gravelly regions. Branches shallowly 6--8-grooved, puberulous, glabrescent. Leaves 1-or 2-pinnate; petiole 2--6 cm; leaflet blades rhombic-ovate to narrowly ovate, 1--6 × 0.5--2.8 cm, papery, often 3-lobed near base or undivided, both surfaces sparsely puberulous on veins, base broadly cuneate, rounded, or subcordate, margin denticulate, apex acute to ± obtuse; basal veins abaxially flat. Flowers solitary, terminal, or sometimes also in axillary 1--3-flowered cymes, 2--6 cm in diam.; peduncle 0.3--3 cm; bracts short petiolate, similar to leaflets. Pedicel 3.5--16.5 cm, sericeous-puberulous to subglabrous. Sepals 4, yellow, sometimes tinged purple, ascending, narrowly ovate, lanceolate, or oblong, 1.5--4 × 0.6--1.4 cm, abaxially sparsely puberulous, adaxially glabrous or rarely puberulous, margin abaxially velutinous, apex cuspidate, acuminate, or acute. Stamens 5--11 mm; filaments puberulous; anthers narrowly oblong, 2--3 mm, glabrous, apex obscurely apiculate to subobtuse. Ovaries puberulous. Style 0.9--1.5 cm, densely villous. Achenes rhombic-obovate, ca. 4.5 × 2.2 mm, puberulous; persistent style to 5 cm, plumose. Fl. Jun--Sep, fr. Sep--Oct.
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Deciduous woody climber; stems terete, weakly ribbed. Lvs glabrous or sparsely hairy, ± glaucous, 2-pinnate, (3)-8-15-(20) × (2)-7-12 cm; leaflets thin, lanceolate, cuneate to truncate at base, acute; margin sharply toothed, rarely 1-2-lobed at base; petiole (2)-4-8 cm long, glabrous or with fine silky hairs. Fls pendent, ☿, solitary in lf axils. Bracts paired, leaflike, 1-pinnate or simple, not united, inserted below middle of peduncle. Sepals 4, valvate, greenish yellow, glabrous outside, silky hairy inside, with dense hairs near margins, lanceolate, acute, mucronate, 13-19-(27) × 5-8-(15) mm. Anthers 3-4 mm long; filaments ciliate, dilated at base. Achenes compressed, hairy, c. 4 mm long. Style 3-4.5 cm long at fruiting.
Varieties 2 (1 in the flora): North America, Asia (China, India, Mongolia).
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