213 



Fig. 509. Triplasis purpurea (Walt.) Chap. Fl. So. St. 559. (Aira 

 purpurea Walt. Fl. Car. 78. 1788. Tricuspid purpurea A. Gray; 

 Sieglingia purpurea Kuntze.) Purple Sand-grass. — A smooth, 

 erect or spreading, crespitose perennial 3 to 9 dm. high, with nar- 

 row, rigid leaves and simple panicles 2 to 6 cm. long. Spikelets 

 2- to 5-ilowered, 5 to 8 mm. long, with smooth empty glumes (a) 

 and hairy, 2-lobed and short-awned flowering glumes (d). — In 

 sandy soil along the coast, from Maine to Florida and westward 

 to Nebraska and Texas. July-October. 



