A new species, Gymnemopsis phuwuaensis A. Kidyoo, has been discovered in northeastern Thailand and is here described and illustrated. An identification key to all species of the genus is provided. Photographs and a diagnostic comparison with the morphologically similar species G. calcicola Kerr, are also provided. Gymnemopsis phuwuaensis displays clear differences in form and color of the corolla as well as in size of bract and flower. A lectotype for Gymnemopsis pierrei is also designated.

中文翻译：

---

泰国东北部的一个新物种-裸子藻（Aphecynaceae，Asclepiadoideae）

在泰国东北部发现了一个新种，Gymnemopsis phuwuaensis A. Kidyoo，在此进行了描述和说明。提供了该属所有物种的识别码。还提供了照片和形态相似的物种G. calcicola Kerr的诊断比较。太子参在花冠的形状和颜色以及of片和花的大小上显示出明显的差异。还指定了裸藻（Gymnemopsis pierrei）的选型。