Taiwania

Persicaria subterranea, a new species of Polygonaceae (Polygonoideae: Persicarieae) from Xizang of southwest China Persicaria subterranea Bo Li, a new species from Xizang in southwestern China, is described and illustrated in this study. Gross morphology and pollen micromorphology corroborate its placement within Persicaria sect. Cephalophilon. Unique to this section, P. subterranea is the only species known to exhibit subterranean cleistogamous flowers, making it distinct within the sect. Cephalophilon. Morphologically, it shows the closest resemblance to P. glacialis (Meisn.) H. Hara and its variety, P. glacialis var. przewalskii (A.K. Skvortsov & Borodina) M.J. Kong & S.P. Hong. However, it could be readily distinguished from these related taxa by leaf shapes and indumentum, inflorescence structure, number of stamens, and achene morphology. In addition, we provide diagnostic characteristics, a detailed morphological description, line drawing, and information on the distribution and habitat for this new species, as along with comparable photographs of the three related taxa.

本篇研究对源自中国西南部西藏自治区的Polygonaceae科（Polygonoideae族：Persicarieae族）新物种Persicaria subterranea Bo Li进行了描述与图解。通过宏观形态学及花粉微形态学分析，证实其应归于Persicaria sect. Cephalophilon。P. subterranea是该属中唯一已知具有地下闭花受精花的物种，使其在Cephalophilon属中独树一帜。在形态学上，其与P. glacialis (Meisn.) H. Hara及其变种P. glacialis var. przewalskii (A.K. Skvortsov & Borodina) M.J. Kong & S.P. Hong最为相似。然而，通过叶片形状、毛被、花序结构、雄蕊数量和瘦果形态等特征，可以轻易地将它与相关物种区分开来。此外，本文还提供了该新物种的诊断特征、详细的形态学描述、线条图、分布和生境信息，以及与三种相关物种的可比照片。