Herbs perennial, caulescent, <strongly colonial> rhizomes or stolons usually present, bulbs absent. Aerial stems usually 2–8 from base, erect initially, usually becoming decumbent, 5–20(–40) cm, becoming woody proximally, hirsute-pilose on at least proximal 2/3, <hairs curved, loosely and irregularly spreading, nonseptate>. Leaves basal and cauline; stipules oblong, margins narrowly flanged or without free portions, apical auricles absent; petiole 2–7 cm; leaflets 3, green, obcordate, 3.5–12 mm, lobed 1/5–1/3 length, surfaces usually strigose-hirsute, sometimes glabrate, oxalate deposits absent. Inflorescences umbelliform cymes, less commonly irregular cymes, (1–)3–8-flowered; peduncles (3–)5–10(–15) cm. <Pedicels villous, hairs long, spreading>. Flowers distylous, <well above level of leaves>; sepal apices without tubercles; petals yellow to yellow-orange, with prominent red lines proximally, (13–)15–20(–23) mm. Capsules angular-cylindric, abruptly tapering to apex, 10–15 mm, sparsely to densely hirsute-pilose, <hairs long, sometimes mostly along angles>. <Seeds brown, transverse ridges usually white>.
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Rhizomatous; stems 1–3 dm, eventually much branched, villous below with hairs 1–1.5 mm; lfls 6–15 mm wide; infl umbelliform, scarcely surpassing the lvs; pedicels sparsely villous with hairs 0.5–1 mm; pet yellow, 13–20 mm; fr to 20 mm, villous with hairs 1 mm; seeds 1.5 mm. Open woods; Ky. to Fla. and Miss. Apr., May. (O. priceae; Xanthoxalis p.)
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