Description

Key Characters:

Growth Form: Scandent or decumbent vines.

Stems: Stems weakly 4–angled, glabrous.

Roots:

Leaves: Leaves simple. Opposite. Blades broadly ovate, 4–6.3 cm long, 1.8–4.4 cm wide. Apex acute. Base obtuse or truncate. Surfaces sparsely pubescent; blades membranous. Margins serrate. Petioles 8–10 mm long, hispid. Stipules absent.

Flowers: Flowers 6 per verticillaster, axillary, pedicels 4–10 mm long, sparsely pubescent. Calyx nearly radially to slightly bilaterally symmetrical, campanulate, pubescent, enlarging in fruit, the teeth acute, 4–9 mm long, 1.5–2.5 mm wide at base, splitting longitudinally, usually persistent or sometimes only ventral 1/2 persistent. Corolla bilabiate, apparently pale red or pinkish white, moderately tomentose externally, tube narrowly funnelform, straight, 15–17 mm long, upper lip 4–5 mm long, entire or 2-lobed, flat or concave, lower lip 3–4 mm long, 3-lobed, the lobes flat or margins revolute, ovate, of similar size, distal portion of corolla sparsely to densely pubescent externally, the hairs simple or multicellular, occasionally glandular pubescent within, otherwise glabrous; nectary disk often present at base of ovary, annular or developed on anterior side only. Stamens 4, both pairs of similar length or upper pair slightly longer, included within corolla or well–exserted beyond upper lip; filaments inserted near throat, pubescent; anthers dithecal; anther sacs divaricate, opening by longitudinal slits. Ovary superior, 2-carpellate, each carpel longitudinally divided, placentation basal-axile; ovules 1 per ovary lobe; style 1, exserted, arising between lobes, usually cleft, diverging after anther dehiscence, shortly 2-lobed, the lobes subulate; stigmas 2.

Fruit: Fruit unknown. Seeds unknown.

Ploidy:

Habitat: Possibly extinct; formerly occurring in wet forest.

Elevation Range: