Oxalis thompsoniae

Herb with stems prostrate or decumbent, to 45 cm long, glabrescent to moderately antrorse-hairy, sometimes patent septate hairs also present; taproot poorly developed; bulbils absent. Leaves cauline, 3-foliolate; leaflets subsessile, cuneate-obovate, 3–16 mm long, 5–20 mm wide, bilobed, glaucous, glabrous to pubescent above, often more densely hairy below, margins ciliate, sinus to c. one-third leaflet length, lobes oblong to slightly obovate, apices rounded, 3–6(–10) mm apart; petioles (4–)15–50(–90) cm long, with simple antrorse hairs; stipules conspicuous, 1–3 mm long, apex rounded, ciliate. Inflorescences axillary, flowers 1–4(–6)-flowered, held below, at or a little above leaf level; peduncles mostly shorter than leaves, sparsely antrorse-hairy; pedicels usually deflexed in fruit (but capsules erect). Sepals oblong, 2–4 mm long, often ciliate. Petals (4–)8–12 mm long, yellow. Capsule 5–16 mm long, 1.9–2.5(–3) mm diam., moderate to broad cylindrical, usually densely retrorse-hairy, also longer patent septate hairs present; seeds (1.3–)1.5–1.8 mm long, very compressed, smooth or shallowly ribbed, uniformly coloured, ribs without greyish or whitish lines or blotches. Flowers winter–summer.