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 trivialis L., Sp. Pl. 1: 67. 1753. subsp. trivialis Fig. 8 Type. Habitat in Europae pascuis, no date, Hudson 16 (neotype, designated by Soreng in Cafferty et al. [2000 : 256]: LINN (LINN-87.9!)). Many heterotypic synonyms. - P. sect. Pandemos Asch. & Graebn., Syn. Mitteleur. Fl. 2: 425. 1900. Type, P. trivialis L. Distribution. South Africa, Gautan Province. Introduced, native to western Eurasia and North Africa, introduced to sub-Saharan Africa in Zimbabwe and South Africa. Ecology. ruderal of temperate climates. Flowering. spring. Economics. rarely collected. Sometimes seeded for pastures, invasive. Vouchers. South Africa . Gauteng: Johannesburg, Rosebank 50 Bath Ave., 28 Dec 1962, Meredith s.n. (PRE0021311-0); Gauteng: Johannesburg, Hort. Rosebank, Mar 1965, Meredith s.n. (PRE0029743-0). Notes. Poa trivialis subsp. trivialis is reputedly self-incompatible and sexually reproducing ( Connor 1979 ). It can be quite invasive in temperate climates with a cool wet season. Aesthetically, it makes a poor lawn grass due to its sprawling habit when mown. Valdes and Scholz (2009) recorded it only for Algeria in North Africa. The second major subspecies, P. t. subsp. sylvicola (Guss.) H. Lindb., has bead-like swellings along the stolons and more hair on the lemma marginal veins and is more tolerant of drought: It is infrequently found outside of the Mediterranean basin and Irano-Turainian floristic region, but is reported across northern Africa ( Valdes and Scholz 2009 ). 2 n = 14 , 14 + 1 - 2B, 15, 27, 28 (27 and 28 counts not confirmed to subspecies may represent subsp. sylvicola ). - Vv genotype. Figure 8. Poa trivialis . A whole plant B part of inflorescence with spikelets mostly in lateral view. Images of Meredith s.n. (PRE0021311-0).