MANUAL OF THE GRASSES OF THE UNITED STATES 



537 



lemma indurate down the center, 

 with 3 awns, the middle longest, and 

 no intermediate lobes ; rudiment with 

 3 awns 5 to 8 mm. long and no inter- 

 mediate lobes, usually containing a 

 palea and staminate flower some- 

 times a perfect flower, the lower floret 

 being staminate. % — Rocky hills, 

 southern New Mexico to southern 

 California and Mexico. 



8. Bouteloua filiformis (Fourn.) 

 Griffiths. Slender grama. (Fig. 779.) 

 Resembling B. radicosa; culms erect 

 or geniculate-spreading, sparingly 

 branching, the base not rhizomatous; 

 spikes ascending to spreading, mostly 

 about 1.5 cm. long, sometimes as 

 much as 2 cm.; spikelets mostly 6 to 

 10, very like those of B. radicosa. % 

 — Rocky hills, Texas to Arizona and 

 Mexico; Panama. 



Section 2. Chondrosium (Desv.) Benth. 



Spikes persistent; spikelets crowded 

 (looser in B. eriopoda), pectinate; 

 florets falling from the glumes. 

 (Chondrosium Desv. based on C. 

 procumbens Durand (B. simplex). 



Figure 778. — Bouteloua radicosa. Panicle, X 1 ; spike- 

 let, X 5. (Griffiths 7181, Ariz.) 



Figure 777. — Bouteloua chondrosioides. Panicle, X 1; 

 spikelet, X 5. (Type.) 



Figure 779. — Bouteloua filiformis. Panicle, X 1; 

 spikelet, X 5. (Griffiths 7199, Ariz.) 



9. Bouteloua simplex Lag. Mat 



grama. (Fig. 780.) Annual, tufted, 

 prostrate or ascending ; foliage scant ; 

 blades 2 to 3 cm. long, about 1.5 mm. 

 wide; spike solitary, 1.5 to 2.5 cm. 



