Spiradiclis yangchunensis (Rubiaceae), a new species from Guangdong, China(英文稿)

Spiradiclis yangchunensis, a new species endemic to Guangdong Province, China, is described and illustrated here. It is similar to S. howii H.S. Lo in somewhat woody stems,lanceolate leaves, linear bracts and bracteolates, and salverform flowers, but differs in having glabrous stems and leaves, scorpioid paniculiform inflorescence, small and triangular hypanthium lobes, and low position of stamens in long-styled flowers. Only one population with less than 200 individuals of S. yangchunensis was found at the type locality up to now, and its conservation status is evaluated as Endangered (EN), according to the IUCN Red List Categories and Criteria.