GENEKA OF GRASSES OF THE UNITED STATES. 
159 
Perennial grasses, with usually convolute blades and narrow pan- 
icles. Species about 100, in the temperate regions of the world, 
especially on plains and. steppes; 30 species in the United States, 
mostly in the western part. 
Type species : Stipa pennata L. 
Stipa L., Sp. PI. 78, 1753; Gen. PI., ed. 5, 34. 1754. Linnaeus describes three 
species, S. pennata, S. juncea, and S. avenacea. The first two are from central 
and southern Europe, the third from Virginia. The first species is selected as 
the type. 
