Koenigia medogensis (Polygonaceae: Persicarieae), a Distinct New Species From Xizang, Southwestern China

Koenigia medogensis, a distinctive new species discovered in Medog County, southeastern Xizang, China, is here described and illustrated. The generic placement of this species was validated through integrated morphological and palynological observations, as well as molecular phylogenetic analyses using three cpDNA markers (matK, rbcL, and trnL-F). Within Koenigia, K. medogensis is most closely related to K. mollis but differs significantly in growth habit, leaf shape, inflorescence structure, and achene micromorphology. Crucially, K. medogensis possesses a unique vegetative reproductive strategy, viz. the production of bulbils at both stolon apices and inflorescence apex. This dual-bulbil trait is exceptionally rare within Polygonaceae and likely represents an evolutionary adaptation to the hyperhumid monsoon environment of Medog County as a reproductive assurance strategy.