Argostemma bachmaense, a new species from central Vietnam, is described and illustrated here. The new species is most similar to A. laoticum and A. vietnamicum but can be distinguished from the latter two by having a well‐developed internode with leaf pairs separately arranged along stem, isophyllous or slightly anisophyllous leaves, an oblanceolate to spatulate lamina with attenuate base and lateral veins with 4–5 pairs prominent on abaxially, a terminal, solitary flower, an absent bract, narrowly ovate or broadly lanceolate, 8.5–10.5 × 2.8–4.2 mm petals, 6.5–7.5 mm long stamen with yellow anther, a 8.5–9.5 mm long, exerted style and a globose stigma. Information on ecology, phenology and preliminary conservation assessment of the proposed new species are provided. In addition, we also provide an identification key to the nine Argostemma species found in Vietnam.

中文翻译：

---

Arggostemma bachmaense（蔷薇科，茜草科，Argostemmateae），来自越南中部的新物种

此处描述并举例说明了来自越南中部的新物种Argostemma bachmaense。新物种最类似于A. laoticum和A. vietnamicum但与后两者不同的是，其节间发育良好，叶对沿茎，等叶或稍等叶的叶分别排列，呈倒披针形散布薄层，基部和侧脉减弱，背面突出4-5对，顶生，单生花，无act片，卵形或宽披针形，8.5-10.5×2.8-4.2 mm花瓣，长6.5-7.5 mm的雄蕊具黄色花药，长8.5-9.5 mm，具花柱和柱头球形。提供有关拟议新物种的生态学，物候学和初步保护评估的信息。此外，我们还提供了在越南发现的9种Argostemma物种的识别码。