Description from Flora of China
Compsoa D. Don, nom. rej.
Herbs perennial, with short or sometimes long and creeping rhizomes. Stems usually erect or ascending, sometimes branched distally. Leaves cauline, alternate, subsessile, usually ± amplexicaul. Inflorescence a thyrse or thyrsoid, rarely a raceme. Flowers bisexual, solitary, showy. Perianth campanulate or trumpet-shaped. Tepals 6, free, white or yellow with purplish spots, usually recurved or reflexed distally, usually caducous; outer ones saccate or shortly spurred. Stamens 6, inserted at base of tepals; filaments slightly flattened, proximally connivent to form a short tube; anthers dorsifixed, versatile, extrorse. Ovary 3-loculed; ovules many per locule. Style columnar; stigmatic lobes 3, spreading, apically cleft. Fruit a capsule, broadly cylindric, 3-angled, septicidal. Seeds many, ovate to orbicular, flattened, small.
About 18 species: from the Himalayas to E Asia; nine species (six endemic) in China.
(Authors: Chen Xinqi (陈心启 Chen Sing-chi); Hiroshi Takahashi)