* Rootstock tufted.

P. annua: annual, stems spreading below, 3-] 2 inches high; panicle loosely spreading, 1 1/2-3 inches long; florets not webbed. - Meadows and cultivated ground everywhere. Fl. all the year.

P. bulbosa: stems swollen and fleshy or bulbous at the base, 6 inches high; panicle ovate or oblong, close, about an inch long; florets webbed at the base. - Sandy sea shores. Fl. April, May.

P. trivialis: stems 1-2 feet high, and as well as the leaf-sheaths roughish to the touch; panicle spreading 3-6 inches long; spikelets ovate of 2-3 acute webbed florets. - Meadows and pastures, common. Fl. May and June.

** Rootstock creeping.

P. pratensis: stems 1-2 feet high, and as well as the leaf-sheaths smooth; panicle spreading 2-3 inches long; spikelets ovate or oblong, of 3-4 webbed florets. - Meadows and pastures, common. Fl. May and June.