1) Grass 2) Short-grass 
(from the article `prairie`) ...the central part of the prairie region. Species of porcupine grass, grama grass, wheatgrass, and buffalo grass dominate the vegetation. Sand hills ...
[n] - any of various grasses that are short and can tolerate drought conditions
short-grass noun any of various grasses that are short and can tolerate drought conditions; common on the dry upland plains just east of the Rocky Mountains