Species description reveals a new Argostemma in Hainan Island, suggesting biodiversity in Rubiaceae.
Argostemma baotingense , a new species of Rubiaceae from Hainan Island, southern China, is described. This new species resembles A. bachmaense but can be distinguished by its suberect or creeping stem, linear leaves with a greenish-white abaxial surface, white and glabrous inflorescence, and glabrous calyx. An identification key and photographs of the nine Argostemma species in China are provided.
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