Polygala qii, a new species of Polygalaceae from limestone landform in Southern Hunan, China

Polygala qii , a new species, is described and illustrated from limestone landform in southern Hunan, China. The new species resembles P. fallax and P. arillata in flower structure of the plants, but readily differs from the latter two in having erect and shorter inflorescences (0.2–1cm VS 10–15cm VS 7–10cm), and fewer flowers (1–5 flowers VS 10–30 flowers VS 10–20 flowers), and the latter two have a later flowering period (late March to mid-April VS May to August VS May to October). And it is an extremely unique new species that will hibernate in the hot summer of July and August. Following the IUCN Red List Criteria, P. qii is assessed as ‘Data Deficient (DD)’.