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Raceme rather dense, sometimes with a few short branches below, 3–12 cm. long, up to 12–flowered; peduncle up to 18 cm. long; pedicels 1–2·5 mm. long, papillose to subglabrous; bracts linear–lanceolate, up to 5 mm. long, often denticulate; bracteoles ± 1·5 mm. long.
Stamens 2·5–3·2 mm. long; filaments linear, free, somewhat dilated at the base, pubescent; anthers elliptic–oblong, 1·2–1·4 mm. long, densely short pubescent (hairs c. 0·2–0·3 mm. long) on the back of the connective but usually glabrous at the very tip.
Leaves sessile or shortly petiolate, ± crowded towards the base, up to 15–45 X 3–5 mm., linear to narrowly elliptic acute at the apex, attenuate at the base, thickened and serrulate at the margin, glabrous; midvein very prominent beneath.
Capsule ovoid to subglobose, with 10 distinct nerves connected by weak transversal nerves; valves 2–3 mm. long, as long as or longer than inferior part of capsule.
Stems usually several from the base, ribbed, entirely glabrous or sparsely papillose in the inflorescence region only.
Calyx–lobes narrowly triangular, ± erect, 1·5–2·2 mm. long, with 1–2 pairs of teeth at the margin, glabrous.
Erect or ascending sometimes somewhat twining herb, 7–45 cm. tall from a root–tuber c. 2 cm. thick.
Seeds broadly elliptic in outline, flat, broadly winged, 2–2·4 x 1·2–1·8 mm.
Hypanthium cup–shaped, 10–nerved, sparsely papillose to subglabrous.
Ovary semi–inferior; style c. 2 mm. long.