顶叶组 ding ye zu

Callista Loureiro.

Roots smooth. Stems pseudobulbous, generally compressed clavate or fusiform, often stout, with longitudinal ridges, distal internodes and sheaths reduced, carrying fewer but larger leaves, new shoots starting unpredictably and growing rapidly. Leaves clustered at stem apex, lasting several years; blade leathery, not decurrent at base. Inflorescence usually pendulous, borne from leaf axils near apex of penultimate and older stems, up to 60-flowered. Flowers yellow or white tinged with yellow, never tinged with green.

About 14 species: China, India, Indochina, Myanmar, Thailand; eight species in China.