On the recognition of the long neglected Vitis adenoclada Hand.-Mazz. (Vitaceae) from southern China.

This study reports the recognition of Vitis adenoclada Hand.-Mazz. from southern China. The species was not recognized in the Flora Reipublicae Ropularis Sinicicae and Flora of China treatments. Recent field studies and examination of herbarium collections including the type material suggest that Vitis adenoclada is morphologically similar to V. heyneana, in their densely arachnoid tomentose abaxial leaves, yet it can be easily distinguished from the latter by its red-purple glandular hairs on the young branches (vs. glandular hairs absent in V. heyneana) and inflorescences usually subtended by a tendril at the base (vs. only occasionally with a tendril in V. heyneana). Vitis adenoclada may be a species of hybrid origin, with the highly tomentose Vitis heyneana as one of the parental species, and likely the glandular-hair bearing V. davidii as the other parental species. Vitis adenoclada is recorded from southern China in Guangdong, Guangxi, Guizhou, Hunan and Zhejiang provinces.