New records and key to Poa (Pooideae, Poaceae) from the Flora of Southern Africa region and notes on taxa including a diclinous breeding system in Poa binata Author Soreng, Robert J. Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington DC 20560, USA https://orcid.org/0000-0002-8358-4915 sorengr@si.edu Author Sylvester, Steven P. College of Biology and the Environment, Nanjing Forestry University, Long Pan Road No. 159, Nanjing, 210037, China https://orcid.org/0000-0001-5577-8782 Author Sylvester, Mitsy D. P. V. College of Biology and the Environment, Nanjing Forestry University, Long Pan Road No. 159, Nanjing, 210037, China https://orcid.org/0000-0003-3582-0327 Author Clark, Vincent Ralph Afromontane Research Unit and Department of Geography, University of the Free State, Qwaqwa Campus, Phuthaditjhaba, 9866, South Africa https://orcid.org/0000-0001-5058-0742 text PhytoKeys 2020 165 27 50 http://dx.doi.org/10.3897/phytokeys.165.55948 journal article http://dx.doi.org/10.3897/phytokeys.165.55948 1314-2003-165-27 FACD36B5F24A57F3AD4B88EEDC3EE9B5 Poa pratensis L., Sp. Pl. 1: 67-68, 1753. Type. Russia. Prov. Sanct-Petersburg: 5 km australi-occidentum, 26 June 1997, N.N. Tzvelev N-257 (conserved type, designated by Soreng and Barrie 1999 : 157: BM!; isotypes: B!, C!, CAN!, CONC!, H!, K!, KW!, L!, LE!, LIV!, MA!, MO!, MW!, NSW!, P!, PE!, PR!, S!, SI!, TNS!, US (US3456252!), W!). Many heterotypic synonyms. - P. sect. Poa . Type, P. pratensis L. (Type of genus Poa L.) Distribution. widespread in Lesotho and South Africa. Introduced, mainly from European sources, native and widespread in Eurasia (also native in part in North America) and now around the world. Ecology. cool temperate to subarctic, mesic habitats. Flowering. late spring early summer, to late summer at high elevations. Vouchers. Lesotho . West of Sehlabathebe National Park, on grassy slopes above the Leqooa-Legowa river, S29.859179 E29.055580 , 2310 m alt., sandstone substrate, mesic soil on steep grassy W facing slopes, 21 Feb 2020, S.P. Sylvester et al. 3571 (US). South Africa . Eastern Cape: Naudes Nek pass, near Rhodes, in grassland next to radio tower, S30.765121 E28.092349 , 2585 m alt., basaltic substrate, alpine tussock grassland transitioning to low shrubland dominated by Erica and Helichrysum , fairly heavily grazed by sheep and cattle, gently sloping, moderately deep soil, 13 Feb 2020, S.P. Sylvester et al. 3499 (PRE, US). Notes. There are three major subspecies recognised in Poa pratensis : subsp. angustifolia , irrigata and pratensis . Intermediate specimens are common and difficult to place. Cope and Gray (2009) provide a good account of the distinctions, also see Soreng (2007) . Facultatively apomictic. 2 n = 21-147 (including nearly every number in between). - Php genotype.