Phyllangium sulcatum

Annual, erect herb to 17 cm high; branches weak, terete, glabrous. Leaves elliptic, ovate or narrowly ovate, 2–13 mm long, (1–)2–4 mm wide, glabrous or with a few hairs, margin flat, apex acute. Flowers in few-flowered umbellate clusters in upper axils; peduncles to 65 mm long; involucre 6-veined (rarely with 4 additional secondary veins), tube 3–5 mm long, lobes 1–3 mm long; corolla 2.5–3.5 mm long, lobes c. half as long as tube; styles connate. Capsules c. 2.5 mm long; seeds black, sulcate. Flowers and fruits Aug.–Nov.