Smithsonian Report, 1934. — Hitchcock 



PLATE 6 



Great Plains near Amarillo, Texas. In this semiarid region tlie "short grasses" are in bunches with 

 unoccupied areas between and do not form a continuous turf. Mostly species of Aristida. 



2. A peculiar tussock grass (mossgrass, Acinchne pulvinata) which forms dense hard bunches scarcely to 

 be recognized as a grass. Hills around Cerro de Pasco, Peru; altitude about 14,500 feet. 



