A. alba: stem procumbent at the base, 1-2 feet high; leaves flat; panicle slender, spreading when in flower, contracted after flowering; outer pales thin, awnless or rarely with a minute awn from its base. - Pastures and waste places. Fl. July.
A. vulgaris: smaller and dwarfer than the last; panicle spreading both before and after flowering. - Pastures and waste places. Fl. July.
A. canina: similar to the foregoing, but the panicle less spreading, and the outer pales bear on their back below the middle a fine awn, which slightly protrudes beyond the glumes. - Moist heaths. Fl. July.