MANUAL OF THE GRASSES OF THE UNITED STATES 157 



-Open 



Spreading; spikelets usually not more than 7-flowered. o 

 ground, Texas to Arizona; introduced in Delaware and Iowa. 



28. Eragrostis suaveolens Becker. (Fig. 314.) Annual culms 

 spreading, 20 to 50 cm tall, a ring of glands below the nodes; sheaths 

 with numerous small glandular 

 depressions on the nerves; blades 

 flat, sparsely long-pilose, 2 to 3 

 mm wide ; panicles open, less than 

 half the entire height of the culm, 

 10 to 15 cm or more long, the 

 branches and pedicels spreading, 

 the axils glabrous, the branchlets 

 and pedicels bearing near the sum- 

 mit a glandular depression; spike- 

 lets linear-oblong, 5 to 7 mm long, 



FIGURE 312. Distribution of 

 Eragrostis neomexicana. 



mostly 7- to 9-flowered, rather 

 soft; lemmas keeled, the lower 

 about 2 mm long, the lateral 

 nerves distinct, o Intro- 

 duced in the vicinity of Las 

 Cruces, N.Mex. ; southern Russia. 

 29. Eragrostis arida Hitchc. 

 (Fig. 315.) Annual; culms 

 branching at base, erect or more 

 or less decumbent at base, 20 to 

 40 cm tall; sheaths not glandu- *IGUI BII.-J 

 lar, the hairs at summit in a 

 dense line part way along the collar; blades mostly flat, glabrous, 

 tapering to a fine point, mostly 4 to 8 cm long, 1 to 2 mm wide; 

 panicle mostly one-third to half the entire length of the plant, open, 



Panicle ' xl; 



FIGURE 313. Eragrostis mexicana. Panicle, X 1; floret, X 10. (Smith, N.Mex.) 



the branches, branchlets, and pedicels flexuous, spreading, the lower 

 axils sparsely pilose, the branches solitary or the lower in pairs; 

 spikelets oblong to linear, stramineous or drab, mostly 8- to 15- 

 flowered, 5 to 10 mm long, 1.5 to 2 mm wide, somewhat compressed, 



