Herb to 60 cm. high, laxly branched.. Stems bearing prominent longitudinal ridges 1–2 mm. apart, and sparse stalked glands; stalks up to 1 mm. long.. Leaves sessile, amplexicaul, auriculate; blades obovate (at least the upper leaves), 11–21 cm. long, 2.5–7 cm. wide, obtuse or acuminate, glabrous, somewhat membranous.. Peduncles bearing dense stalked glands; stalks (0.5–)1 mm. long; pedicels up to 1 mm. long; bracts ovate-lanceolate, outer bract 3–4 mm. long, 1.5–2 mm. wide, inner pair minute, rarely up to 2 mm. long, 1 mm. wide, acute or acuminate, glabrous.. Calyx 12 mm. long, 1.5 mm. wide, not prominently ribbed, dark coloured between ribs in basal half, bearing abundant evenly distributed stalked glands; stalks thin, not rigid, 1.5–2 mm. long, those arising from dark region shorter, stouter and darker; calyx-teeth up to 3 mm. long.. Corolla white, tube approximately equalling calyx.. Fig. 3/6, p. 7.
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