94 A Handbook of Nebraska Grasses. 
129. Stipa spartea. Porcupine Grass. (Fig. 46.) 
This resembles the preceding species, but is stouter and 
like it is a great pest to sheep. It is most abundant in the 
eastern Nebraska prairies. 
140. Stipa viridula. Feather Bunch Grass. (Fig. 46.) 
Occurs thruout the State—particularly in western coun- 
ies. 
a TRIPLASIS. 
141. Triplasis purpurea. Sand Grass. (Fig. 67.) 
A low annual grass of the Sand Hill ravines of north- 
western Nebraska. 
TRIPSACUM. 
142. Tripsacum dactyloides. Gama Grass. (Fig. 13.) 
A stout, coarse, perennial of moist soil in southeastern 
Nebraska. When voung it is much liked by stock. 
ZIZANTIA. 
143. Zizania aquatica. Indian Rice. (Fig. 31.) 
An annual grass growing in ponds and along streams 
thruout the State. The nutritious grain is often eaten by 
birds. 
