406 POACE.E. 



3 mm. long. Grain linear. The lower panicles numerous, 5-15 

 cm, long, branching irregularly. Spikelets 4-6 mm. long, ovoid, 

 abruptly pointed. Empty glumes subequal and ovate, but little 

 shorter than the spikelets, manv-nerved; floral glume oval, rather 

 thick, many-nerved ; palea nearly as long and as wide as its glume. 

 Grain oblong, abruptly pointed, about 4 mm. long, much larger 

 than those borne on the upper panicles ; liilum half as long as tlie 

 grain. 



Mexico (Ymala Simaloa), Dr. Palmer 1763. 



Dr. Vasey liad a little doubt regarding the identity of this grass 

 with G. lo7igifoUus Fourn. 



5. C. submutica H. B. K. Nov. Gen. et. Sp. 1:167. t. 50 

 (1815). 



A slender perennial, 30-100 cm. high. Ligule a fringe of 

 hairs; upper blades 3-6 cm. long, 2-4 mm. wide, obtuse, rough, 

 conduplicate, reaching to or above the spikes. Spikes 6-12, each 

 4-12 cm. long, umbellate or in close whorls, an internode about 1 

 mm. long. Empty glumes narrow, acute, membranous, 1-nerved, 

 the lower nearly 2 mm. long, second over 3 mm. long; floret 3.5 

 mm. long, with fine bristles at the base; floral glume membranous, 

 3-nerved, ouneate-oval when spread, margins ciliate, apex emargi- 

 nate, awn very short; palea oblanceolate, emarginate, ciliate; upper 

 empty glumes at tlie apex of the rachilla extending nearly to the 

 apex of the floret, 1.7 mm. long, 3-nerved, truncate with a very 

 short awn. Grain oblong, 2 mm. long, 3-sided. 



Mexico, Bourgeau, Palmer 242, Pringle 424, Schaffner 1074. 



Northern Mexico and vicinity. 



This is similar to C. elegans in character and quality, but rather 

 more erect in habit. 



6. C. ciliata Sw. Fl. Ind. Occ. 1: 25 (1797). 



An erect annual, 30-60 cm. liigh. Sheatlis about the length of 

 the internodes; ligule very short; blades flat, smooth, acuminate, 

 15 cm. long, 3-5 mm. wide. Spikes 3-6, digitate, purplish, the apex 

 curved, 4-6 cm. long. Spikelets 3-flowered, crowded, subsessile, 

 flattened, cuneate, truncate, 2.5 mm. long, awns projecting about 1 

 mm.; floral glume of the perfect floret elliptical, long-ciliate on the 



