Abstract
Based on extensive field investigations in karst habitats of southern China (Guangxi) and adjacent Indochina, cultivation and detailed morphological examination of living plants, and critical study of herbarium specimens (including types), a taxonomic revision of the genus in this region is presented. This study demonstrates that two species previously subsumed into the broadly defined O. intermedius complex (O. compressus and O. longipedicellatus) possess stable diagnostic morphological characters and distinct ecological niches, warranting their reinstatement as independent species. Furthermore, three new species from the limestone areas of Guangxi are discovered and described: O. dahuaensis, O. crassifilamentus, and O. napoensis.
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