Ophiorrhiza shiqianensis (Rubiaceae), a new species from Guizhou, China.

A new species of the genus Ophiorrhiza L. (Rubiaceae), Ophiorrhiza shiqianensis L.D.Duan & Yun Lin, is described, illustrated and photographed from Shiqian County, Guizhou Province, South-western China. This species was found growing at the side of streams in evergreen broad-leaved forests in mountains at elevations of 960-1100 m. The new species is morphologically similar to Ophiorrhiza hunanica H.S.Lo, but differs from the latter by the glabrous, glabrescent or pilose stems, the 5-10 cm long subterranean stem internodes, the glabrous or pilose petioles, the 3-5 mm long stipules, the purple corolla lobes, the ca. 12 mm long style and included stigmas in long-styled flowers and the 3-4 × 8-10 mm, glabrous or glabrescent capsules. [ABSTRACT FROM AUTHOR]