Heterostemma cucphuongense (Apocynaceae, Asclepiadoideae), a new species from Vietnam is described, illustrated and compared with the similar species Heterostemma succosum Kerr. Heterostemma cucphuongense differs from H. succosum by the morphology of the rachis of the inflorescence, the margins of the corolla lobes and the colour of the adaxial surface of the corolla.

中文翻译：

---

Heterostemma cucphuongense（Apocynaceae，Asclepiadoideae），一种来自越南的新物种。

描述，说明并比较了来自越南的一个新物种Heterostemma cucphuongense（Apocynaceae，Asclepiadoideae），并将其与相似物种Succosum succosum Kerr进行了比较。异头藻与蔗糖的区别在于花序轴的形态，花冠裂片的边缘和花冠的近轴表面的颜色。