CHLORIDES. 41^ 



(1857). Cliondrosum [CJiondrosium] polystachyum Beuth. Bot. 

 Sulph. 56 (1844). 



Culms smooth, erect, or spreading and geniculate, 20-40 cm. 

 high. Leaf-blades narrow, 3-6 cm. long, ciliate at the ligule. 

 Spikes 3-6 or more, erect, linear, about 2 cm. long. Empty glumes 

 hyaline, glabrous, oval, 1-nerved, mucronate or short-awned. often 

 lobed or emarginate, first 1 mm. long, second 1.5 mm. long: floral 

 glume broadly oval, the margins and back densely hairy, 1.5 mm. 

 long, 3-lobed with stout seta? scarcely longer than the lobes, central 

 awn slightly longest ; palea as long as its glume, 3-lobed, rachilla 

 hairy, bearing 3 set^e, a small neutral floret, and above this a minute 

 empty glume. 



Texas, XeaUey for Xat. Mns. ; Lower California, Palmer 126, 

 508. 



Texas, Arizona, to California. 



7. B. arenosa Vasey, Grasses of S. West. Bull. 12, Part 1, 34 

 (1890). 



A slender diffuse annual, 15-25 cm. high. Sheaths loose, 3-4 

 in number, half as long as the internodes; ligule lanceolate, 5 mm. 

 long, ciliate at the base; blades flat, .3-5 cm. long. 1.5-2 mm. 

 wide. Panicle 5-6 cm. long, bearing 3-4 straight or curved one- 

 sided spikes. Spikes subsessile, about 2 cm. long, bearing about 

 20 spikelets. Spikelets closely imbricate, each containing 1 perfect 

 and 1 rudimentary floret, about 3 mm. long, with awns projecting 

 3 mm. Empty glumes 1-nerved, often 2-toothed, first lanceolate, 

 2 mm. long, second oval, 3 mm. long, short-awned; floral glume of 

 the lower floret 2 mm. long, besides the teeth, clothed with fine 

 pubescence, ovate, 2-toothed, awns equal orsubequal; palea as long 

 as its glume, 2-4-toothed, with 2 short awns, second floret 1.5 

 mm. long, the 3 subequal, awns 4-5 mm. long. Xeutral floret 

 bearing 3 subequal awns, 4-5 mm. long. 



Mexico (near Gulf of California), Palmer 189, Orcuff. 



8. B. vestita fS. Wats.) Scribn. ined. B. pohjstachya Torr. var. 

 vestita S. Wats. Proc. Amer. Acad. 18: 177 (1883). 



A tufted erect or diffuse grass apparently annual, 20-60 cm. 

 high. Sheaths ciliate at the throat: lieule verv short; blades of the 



