486 



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



Culms white felty-pubescent 5. H. rigida. 



Culms not felty-pubescent. 



Cluster of spikelets not flabellate; glumes of lateral spikelets narrowed toward summit. 



4. H. JAMESII. 

 Cluster of spikelets flabellate; glumes (at least the outer one) of lateral spikelets broadest 

 toward summit. 

 Glumes subhyaline and fimbriate at summit; plants tufted, not stoloniferous. 



3. H. MUTICA. 



Glumes firm, not fimbriate; plants stoloniferous (except in H. belangeri var. longifolia). 



Glumes of lateral spikelets much shorter than the florets, pale; group of spikelets 



mostly 5 mm. long 1. H. belangeri. 



Glumes of lateral spikelets about equaling the florets, blackish; group of spikelets 

 7 to 8 mm. long 2. H. swallexi. 



1. Hilaria belangeri (Steud.) Nash. 

 Curly mesquite. (Fig. 715.) Plants these producing new tufts, the inter- 

 in tufts, sending out slender stolons, nodes of the stolons wiry, 5 to 20 



I'iglre 715. — Hilaria belangeri. Plant, X Yi\ two views of group of spikelets, X 5; fertile spikelet, staminate 



spikelet, and fertile floret, X 5. (Hitchcock, Tex.) 



