Ornithoboea arachnoidea (Diels) Craib

Stems 5-45 cm, cobwebby-woolly. Petiole 3-10 cm; leaf blade ovate to broadly ovate, seldom narrowly elliptic to oblong, 3.5-15 X 3.5-10 cm, adaxially puberulent, abaxially puberulent, villous to cobwebby-woolly along veins, margin serrate, apex acute to obtuse. Peduncle 2-4 cm, cobwebby-woolly; bracts inconspicuous. Pedicel 0.5-2.5 cm. Calyx segments reflexed, ovate to obovate or oblong ovate, 8-10 X 2.5-4 mm, outside woolly. Corolla blue to blue-purple, ca. 1.5 cm, densely purplish ciliate inside adaxial lip, purplish bearded on abaxial lip from central lobe to mouth; tube 4-5 X 5-6 mm; adaxial lip 3-4 mm, lobes ca. 1 mm; abaxial lip 0.9-1.1 cm, lobes oblong, 4-5 mm. Stamens ca. 4 mm, glabrous; filaments simple; staminodes 3, ca. 2 mm. Ovary ovoid, ca. 2.5 mm, densely woolly to pubescent. Style 6.5-7.5 mm, sparsely puberulent. Capsule 1.2-2 cm. Fl. Jul-Aug, fr. Jul-Oct.

W Yunnan [NW Thailand].

Crevices of rocks or slopes; 1800-2000 m.

Boea arachnoidea Diels, Notes Roy. Bot. Gard. Edinburgh 5: 225. 1912; Ornithoboea forrestii Craib.