About 500 species, incluing: Poa abbreviata - Short Bluegrass Poa alpigena - Northern Meadow-grass Poa alpina - Alpine Meadow-grass Poa alsodes - Grove Bluegrass Poa angustifolia - Narrow-leaved Meadow-grass Poa annua - Annual Meadow-grass Poa arachnifera - Texas Bluegrass Poa arctica - Arctic Meadow-grass Poa badensis Poa bulbosa - Bulbous Meadow-grass Poa cita - Silver Tussock Poa compressa - Flattened Meadow-grass Poa chaixii - Broad-leaved Meadow-grass Poa chathamica Poa colensoi - Blue Tussock Poa douglasii - Douglas Bluegrass Poa dura Poa flabellata Poa flexuosa - Wavy Meadow-grass Poa glauca - Glaocous Meadow-grass Poa infirma - Early Meadow-grass Poa iridifolia Poa labillardieri Poa nemoralis - Wood Meadow-grass Poa palustris - Swamp Meadow-grass Poa pratensis - Smooth Meadow-grass, Kentucky bluegrass Poa seconda - Sandberg's Bluegrass Poa subcaerulea - Spreading Meadow-grass Poa supina - Creeping Meadow-grass Poa trivialis - Rough Meadow-grass