Description

Key Characters:

Growth Form: Creeping vines.

Stems: Stems sharply 4–angled, sparsely tomentose, retrorse hairs concentrated on stem angles.

Roots:

Leaves: Leaves simple. Opposite. Blades ovate to suborbicular, 1.8–2.7 cm long, 1.6–2.1 cm wide. Apex obtuse. Surfaces glabrous; blades membranous. Margins crenate. Petioles 6–12 mm long, sparsely pubescent. Stipules absent.

Flowers: Flowers 6 per verticillaster, axillary, pedicels 3–8 mm long, glabrous. Calyx weakly bilabiate, narrowly campanulate, 5–7 mm long, enlarging in fruit, glabrous, the teeth obtuse, 0.5–1.5 mm long, 1.5–2.5 mm wide, splitting longitudinally, usually persistent or sometimes only ventral 1/2 persistent. Corolla bilabiate, very pale pink, tomentose distally externally, glabrous within, tube narrowly funnelform, nearly straight, 10–17 mm long, upper lip 4–6 mm long, entire or 2-lobed, flat or concave, lower lip 1.5–4 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: Nutlets unknown. Seeds with endosperm absent or scanty and oily.

Ploidy:

Habitat: Rare in wet forest.

Elevation Range: