高野 温子

Astragalus nasirii is described and illustrated here as a new species from Tehsil Utman Khel in Bajaur District of Khyber Pakhtunkhwa Province, Pakistan. Morphologically, the species closely resembles A. flemingii but can be distinguished by its longer leaves bearing 13–32 pairs of ovate to narrowly elliptic leaflets with obtuse to slightly retuse apices, calyx sparsely pilose with narrow to broadly triangular teeth, a long‐stipitate ovary, broadly ellipsoid legumes with a stipe up to 5 mm, and markedly larger seeds. In addition to morphological, palynological, and seed micromorphological evidence, phylogenetic analyses based on nuclear ITS and plastid psbA–trnH sequences were conducted. The results recovered A. nasirii within Astragalus sect. Caprini , showing close affinity with A. flemingii . The distribution, morphological comparison with closely related species, illustrations, and conservation status of the new species are also presented.