biostudies-literatureUnknown214Liu ZC<i>Argostemmaehuangzhangense</i>, a new Rubiaceae species from E'huangzhang Nature Reserve, Guangdong Province, China, is here described and illustrated. A morphological comparison between the new species and its putative relatives, <i>A.lamxayanum</i>, <i>A.laotica</i> and <i>A.verticillatum</i>, is presented. The new species is mostly similar to <i>A.laotica</i>, but they can be distinguished from each other since <i>Argostemmaehuangzhangense</i> presents solitary flower (vs. 2-flowered inflorescences), flower lobes 4 (vs. 5) and anthers opening by longitudinal slits (vs. apical pores). In a preliminary IUCN Red List status of <i>Argostemmaehuangzhangense</i> this species is assigned as Vulnerable (VU).PhytoKeys75-82https://www.ebi.ac.uk/biostudies/studies/S-EPMC9836731biostudies-literature<i>Argostemmaehuangzhangense</i> (Rubiaceae), a new species from Guangdong, China.PMC9836731Liao WBLiu JZhao WYYe HGLiu ZCFan QWang Lfalse<i>Argostemmaehuangzhangense</i> (Rubiaceae), a new species from Guangdong, China.<i>Argostemmaehuangzhangense</i>, a new Rubiaceae species from E'huangzhang Nature Reserve, Guangdong Province, China, is here described and illustrated. A morphological comparison between the new species and its putative relatives, <i>A.lamxayanum</i>, <i>A.laotica</i> and <i>A.verticillatum</i>, is presented. The new species is mostly similar to <i>A.laotica</i>, but they can be distinguished from each other since <i>Argostemmaehuangzhangense</i> presents solitary flower (vs. 2-flowered inflorescences), flower lobes 4 (vs. 5) and anthers opening by longitudinal slits (vs. apical pores). In a preliminary IUCN Red List status of <i>Argostemmaehuangzhangense</i> this species is assigned as Vulnerable (VU).2022-01-01T00:00:00Z20222025-04-18T21:18:01.109Z2025-04-07T09:16:16.104ZS-EPMC98367313676055310.3897/phytokeys.214.89276