Oxalis obtusa

Herb with stems developed only when plants growing in shade; bulbs ovoid, 5–15 mm long, often fusiform, deeply pitted and irregularly angled, tunics tough, reddish- to blackish-brown; bulbils formed in axils of scales along rhizome. Leaves basal, 3-(rarely 5-)foliolate; leaflets subsessile, variable, often dimorphic, obcordate to linear-emarginate, 4–10(–25) mm long, 3–7(–25) mm wide, shallowly bilobed, green, sometimes purplish below, glabrous to pubescent on both faces, margins ciliate, sinus to one-eighth leaflet length, lobes with rounded apices 2–5(–12) mm apart; petioles 1.5–5.5 cm long, sparsely hairy; stipules inconspicuous, membranous, to c. 1.5 mm long, abruptly tapering into petiole. Inflorescences basal, 1-flowered; peduncles longer than leaves, sparsely hairy. Sepals oblong to oblong-lanceolate, 4–8 mm long, glabrous to pilose, base with some retrorse hairs, margins ciliate, rarely with apical calli. Petals 10–15(–25) mm long, pale yellow to pale salmon-pink with fine dark red veins, usually a deeper yellow in throat. Capsule not developed in Australia. Flowers mainly mainly Aug.-Oct.