The following species in the grass genus Poa are accepted by Plants of the World Online. Speciation in this genus is marked by interspecific and even intergeneric hybridization events. * R.Br. * Buchanan * É.Desv. * Steud. * J.Presl * (Swallen & Tovar) Refulio * Hack. * Tovar * Poa affinis R.Br. * Bor * Boiss. * Prob. * Soreng, P.Hein & H.Scholz * Regel * Hitchc. * Prob. * Golub * (Gaudich. ex Mirb.) Kunth * Poa alpigena Lindm. * Poa alpina L. * A.Gray * Hitchc. * C.M.Weiller & Stajsic * (Tovar) Refulio * Prob. * Tovar * G.Forst. * Hack. * Poa angustifolia L. * A.Camus & H.Perrier * Poa annua L. * Petrie * Refulio * Poa arachnifera Torr. * Trautv. * Prob. * Poa arctica R.Br. * Parodi * Poa arida Vasey * Soreng * Noso