Trianthema triquetrum

Prostrate or diffuse, annual herb; branches to 60 cm long, papillose. Leaves terete to clavate, 6–8 mm long, 2–4 mm wide; glabrous, mid to dull green, apex obtuse; petiole 2–4 mm long, expanded into a toothed sheath. Flowers sessile, in dense clusters of 3–6, each flower subtended by 3 acuminate bracts; perianth tube 1–2 mm long, lobes ovate-triangular, c. 1 mm long, papillose near apex, white to pink; stamens 5. Operculum 1–1.5 mm diam., thick-walled, rounded with an impressed membranous cover; seeds 2, disc-shaped, black, 1–1.5 mm long.