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 infirma Kunth, Nov. Gen. Sp. 1: 158. 1816. Fig. 4 Megastachya infirma (Kunth) Roem. & Schult., Syst. Veg. [Sprengel] 2: 585. 1817. Eragrostis infirma (Kunth) Steud., Nomencl. Bot. (ed. 2) 1: 563. 1840. Ochlopoa infirma (Kunth) H. Scholz, Ber. Inst. Lanschafts - Pflanzenokologie Univ. Hohenheim Beih., 16: 59. 2003. = Poa annua var. exilis Tomm. ex Freyn, Verh. K. K. Zool.-Bot. Ges. Wien. 27: 469. 1878. Poa exilis (Tomm.) Murb. ex Asch. & Graebn. Acta Univ. Lund. 4: 73. 1905. Type protologue: S Europe: Istria: Langs der Kust von Fasana bis Medolino, auch auf S. Marina, 1872, Tommasini s.n. Lectotype: Italy. S. Marina, 24 Mar. 1873, Tommasini s.n. (lectotype, designated by Soreng and Fulvio Tomsich Caruso in Sylvester et al. 2020 : TSM!). - P. sect. Micrantherae Stapf Type. Colombia. Crescit in frigidis regni Novogranatensis, inter Fonibon, Suba et Santa Fe de Bogota, 1360 hexap. [2448 m], floret. Aug, Humboldt & Bonpland s.n. (lectotype, designated by Sylvester et al. 2020 : P (P00669436!, herb. Humboldt & Bonpland Ameriqui Ecuatorial; isolectotypes: P (P00128983!), US (US1851276! fragm. ex P, US2851277! {134; Aug 1801; Colombia [ex P-Bonpl.]})). Distribution. Introduced to the FSA region and found in Namibia and the Western Cape Province of South Africa. Native to the Mediterranean Sea region of Europe, North Africa and western Asia. Ecology. ruderal. Flowering. early spring. Economics. infrequent, insignificant. Vouchers. Namibia . Noordoewer: Motel flower beds, 14 Sep 1981, L. Smook 3576 (PRE). South Africa . Western Cape: Swellendam District, Sep 1962, L.C.C. Liebenberg 6495 (PRE); Western Cape: Porterville, Dasklip pans, wet gully up pass, 7 Oct 1981, L. Smook 3672 (PRE). Notes. First report for South Africa and sub-Saharan Africa. Poa infirma is one of the diploid parents of the tetraploid species, Poa annua . The species is self-compatible, inbreeding. 2 n = 14 . - Mimi genotype. Figure 4. Poa infirma . A whole plants B-D close-up of inflorescence showing spikelets generally in lateral view and miniscule anthers (a). Image A, B of Smook 3576 (PRE0652756-0) C, D of Smook 3672 (PRE).