Gomphostemma dolichobotrys

Perennial herb up to 2 m tall. Stems erect, obtusely quadrangular with longitudinal grooves, with a mixture of coppery-coloured dense dendroid hairs with a 3 – many-celled stalk and stellate hairs. Leaoes petiolate, chartaceous; blades broadly elliptic-ovate, 13 – 23 × 9 – 13 cm, apex acute, margin shallowly dentate, base cuneate; upper side dull green with 2 – 3 - celled simple hairs, lower side pale green tomentose with dense stellate hairs and dendroid hairs confined on midrib and veins and with sparse pale yellow punctate glands; petioles 30 – 50 mm long. Inflorescence axillary, raceme-like with opposite cymes unbranched, lax with axis visible between flowers, 20 – 80 (– 100) mm long, inserted at the upper nodes at which leaves are usually present; verticils 3 – 6 (– 8) - flowered; peduncles (13 –) 30 – 60 mm long; bracts deciduous, not seen; bracteoles linear, narrowly elliptic or slightly falcate, 3 – 10 mm long. Flowering calyx tubular or narrowly infundibular, 6 – 10 mm long, 10 - ridged, outside with a mixture of dense hairs, inside with adpressed simple hairs; tube 2 – 5 mm long; lobes 2 – 3 mm long, apex acute. Fruiting calyx tubular-infundibular, 5 – 11 mm long; tube 3 – 8 mm long; lobes 2 – 3 mm long. Corolla white, 13 – 20 mm long, throat narrow, gradually dilated towards the throat, outside tomentose with dense stellate hairs, inside glabrous; tube slender, straight, 8 – 13 mm long, hardly exserted from calyx; posterior lip hood-like, ovate, 2 – 3 mm long; anterior lip slightly longer than posterior lip, 3 - lobed, subequal, ovate. Staminal filaments fleshy, tomentose. Style slightly fleshy, glabrous with apex subequally lobed. Nutlets solitary, 3 – 6 mm long.