Insights to the taxonomy and phylogeny of the genus Ptilagrostis worldwide (Poaceae, Stipeae) with a key to species identification, checklist and outlines for further studies

Cross-sections through vegetative leaves of P. duthiei (a, b), P. contracta (c, d), P. malyschevii (e), P. alpina (f), P. chingii (g, h), P. bhutanica (i), P. junatovii (j), P. arcuata (k), P. concinna (l), P. yadongensis (m, n), P. luquensis (o), P. mongholica subsp. mongholica (p), P. dichotoma (r), P. tibetica (s), P. glabrifolia (t). Abbreviations: (1) sclerenchyma strand, (2) ribs, (3) vascular bundles, (4) prickle-hairs. Scale bars: 100 µm. List of studied specimens is presented in Suppl. material 1.