Creeping or scandent herb or shrub, laxly branched, 0.9–5.7 m.. Stems wiry, tough, usually woody, glabrous, bearing fine closely spaced longitudinal ridges, spaced 4 per mm.. Leaf-blades ovate, ovate-lanceolate, elliptic or oblong, rarely orbicular, broad or narrow, 5.5–18 cm. long, 2.5–7 cm. wide, acute, acuminate or mucronate, base rounded or rarely cuneate, glabrous; petiole 1–2 cm. long, base amplexicaul, sometimes auriculate.. Peduncle bearing sparse inconspicuous or sometimes prominent sessile glands, or glabrous.. Flowers scented; pedicels 1–2 mm. long; bracts ovate, ovate-lanceolate or lanceolate, 2–8 mm. long, 1–2.5 mm. wide, acute, acuminate or mucronate, glabrous.. Calyx (10–)15–20 mm. long, 1.5–2.5 mm. wide, seldom prominently ribbed, bearing abundant stalked glands; stalks thin, not rigid, often curved, 1.5–2 mm. long; calyx-teeth 1.5–2 mm. long.. Corolla white; tube 24–27 mm.; lobes obovate, (9–)10–13 mm. long, 5–6 mm. broad, acute, with shortly excurrent central nerve.. Fig. 3/2, p. 7.
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