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Capsule 10–19 × 2–2·5 mm., glabrous, rarely puberulent, pale brown with 4 prominent dark brown ribs, sharply 4-angled with 4 nearly flat walls, irregularly and readily loculicidal, subsessile or on a pedicel up to 2 mm. long.
Leaves 2–13 × 0·2–4·5 cm., lanceolate to elliptic, rarely ovate, narrowly cuneate at the base, the apex acuminate to acute, rarely obtuse; main veins 16–27 on each side of midrib; petiole 2–15 mm. long.
Seeds 0·3–0·4(0·5) × 0·2–0·3 mm., pluriseriate in each locule of the capsule, free, pale brown, minutely cellular-pitted, elongate-obovoid; raphe c. 1/5 the diameter of the body.
Subglabrous erect herb from 3 cm. to more than 3 m., sometimes more or less woody at base, freely branched, the stems sharply angled from the decurrent leaf-bases.
Stamens 8, subequal; filaments c. 1·5 mm. long; anthers c. 0·6 mm. long, shedding pollen directly on the stigma at anthesis.
Disk not elevated, with a sunken, white-hairy nectary around the base of each epipetalous stamen.
Style 0·5–1 mm. long; stigma globose, 1–1·1 mm. thick, its upper 2/3 receptive.
Sepals 4, 2–6 × 1–1·5 mm., lanceolate-acuminate.
Petals 3·5–5 × 2–2·5 mm., obovate.
Flowers solitary in upper axils.
Bracteoles c. 0·5 mm. long.
Pollen shed in tetrads.
