Triumfetta setulosa Mast.

Annual or short-lived subshrub 0.15–1 m tall; stems rigidly erect, rarely the laterals decumbent, 1–2.5 mm diameter, black or greenish brown, smooth, moderately covered in fine white or pale brown stellate hairs, or less usually long simple hairs.. Leaves rhombic-elliptic or oblong-lanceolate, always unlobed, 2.5–7(–10.5) cm long, 1.1–3.1(–4.2) cm wide, apex acute to rounded, base cuneate to slightly cordate, margin serrate, subglabrous to subscabrid above with either or both stellate and simple hairs, tomentellous beneath with white or pale brown stellate hairs, rarely subglabrous (in shade growth); petiole distinctly swollen at tip, ± terete, 0.4–1.2(–1.8) cm long, 0.5 mm wide, indumentum as stem; stipules persistent, black, triangular, 3–6 mm long, 0.25–0.75 mm wide, densely covered in long simple hairs outside.. Inflorescence terminal, with 0–6 branches each 5–30 cm long, nodes all with slightly reduced leaves,each node 5–35 mm apart, with 3–6 leaf-opposed cymes; cymes (1–)3-flowered, peduncle 2–3.5 mm long, indumentum as stem; bracts as stipules, 1.5–2.5(–4) mm long, 0.5 mm wide; pedicels 0.5–2 mm long.. Sepals narrowly oblong, 4–4.5 mm long, 0.75 mm wide, with a few scattered simple hairs, the apical spine 0.5 mm long.. Petals rounded oblong, 4–4.5 mm long, 1 mm wide, the poorly defined claw sometimes glabrous at the base; stamens (5–)10; ovary sub-villose.. Fruit dehiscent, subglobose, 8–10 mm diameter, with 98–120 patent bristles, each 2(–3) mm long, densely to sparsely covered in stiff, brown patent hairs, the tip with a cluster of 1–4 short hairs.. Fig. 12/4–6 (p. 77).