476 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Figure 696. — Ari&tida wrightii, X 1. (Ball 1511, Tex. 



% — Texas to Colorado and Ari- 

 zona. 



Aristida longiseta var. robusta 

 Merr. Taller and more robust, 30 to 

 50 cm. tall, the blades longer and not 

 in conspicuous basal tufts, the pan- 

 icle longer, stiffer, and the branches 

 more stiffly ascending, the awns 

 mostly 4 to 5 cm. long. % —Same 

 range but more common northward, 

 extending east to Minnesota and 

 west to Washington and California. 



27. Aristida fendleriana Steud. 

 Fendler three-awn. (Fig. 698.) 

 Resembling A. longiseta; differing in 

 the numerous short curly blades at 

 the base of the plant, the shorter 

 glumes (the first about 7 mm. long), 

 the gradually narrowed lemma, sca- 

 berulous on the upper half, and the 

 shorter awns (2 to 5 cm. long). % 

 — Dry plains and hills, North Dakota 

 and Montana, south to Texas, Ne- 

 vada, and southern California; Mex- 

 ico. 



28. Aristida lanosa Muhl. ex Ell. 

 (Fig. 699.) Perennial; culms solitary 

 or few in a tuft, rather robust, 1 to 

 1.5 m. tall; sheaths lanate-pubescent 

 or rarely glabrous; blades flat, elon- 



Figure 697. — Aristida longiseta, X 1. (Thompson 63, Kans.) 



