Richthofenia siamensis Hosseus.

Visible body globose. Inflorescence bracts 10, scale-like, fleshy, imbricate, broadly triangular to ± rounded, basalmost ones minute, apical ones larger and ovate. Perianth campanulate; tube outside white, inside purple, semiglobose, 6-8 cm, inner surface longitudinally 20-ribbed and pubescent; lobes 10, 2-seriate, broadly triangular, 6-8 × 4-6 cm, imbricate, with rose-yellowish warts, exterior surface with many linear warts. Male flowers: anthers 2-loculed, broadly ellipsoid, dehiscent by apical pores; apical cupular body base convex; gynostegium blood red. Female flowers: cupular body base concave, with sterile stamens; gynostegium stouter than stamens. Fl. Aug-Sep.

Parasitic on roots of Vitis and Tetrastigma; 800-1200 m. SE Xizang, S Yunnan [NE India, Myanmar, Thailand, Vietnam].