Gomphostemma microdon Dunn

A folk remedy for pneumonia, bronchitis, nephritis, urinary tract infections, and urolithiasis.

Herbs erect. Stems ca. 1 m tall, densely gray stellate tomentulose. Petiole 1-4 cm; leaf blade oblong to elliptic, 8.5-24 × 3.5-10 cm, adaxially with overlapping stellate hairs, abaxially densely dark gray stellate tomentose, base acute to cuneate and sometimes asymmetrical, crenate-serrate or shallowly serrate, apex somewhat obliquely acute to obtuse. Inflorescences erect, axillary, 6.5-10.5 cm; peduncle 1.6-3.2(-7) cm; cymes 1- or 2- (or 3)-flowered; bracts oblong to lanceolate, 1.1-2.2 cm × 3-8 mm; bracteoles linear, 6-11 mm. Calyx narrowly campanulate, 5-7 × ca. 3.5 mm, veins very conspicuous; teeth broadly triangular, ca. 1 mm. Corolla purplish to yellowish, 1.6-2 cm; tube 1-2 mm wide at base, 6-7 mm wide at throat; upper lip circular, ca. 3.5 × 4.5 mm; lower lip ca. 6 × 7.5 mm, middle lobe longest. Nutlets 3, blackish brown, compressed oblong, ca. 4 × 2.5-3 mm, apically somewhat dilated, glabrous, grooved. Fl. and fr. Aug-Dec.

Yunnan [Laos]

Tropical rain forest valleys and plains; 600-1300 m.