Millet Tribe 25 



6. CHAETOCHLOA Scribn. BRISTLY FOXTAIL. 



Annual or perennial grasses with erect culms, flat 

 leaves, and dense cylindric or somewhat open bristly 

 spike-like panicles. Spikelets hermaphrodite, usually 1- 

 flowered. Glumes 4, the outer 3 membranous, the third 

 often subtending a hyaline palea and rarely a staminate 

 flower, the fourth or flowering glume chartaceous, 

 smooth or transversely rugose, inclosing a palea similar 

 in texture. Stamens 3. Styles distinct. Grain free, 

 enclosed within the glume and palea. 



1. C. glauca (L.) Scribn. An erect or ascending csespitose 

 glaucous annual, 3-12 dm. high; culms branching at the base, 

 compressed, glabrous; nodes smooth; sheaths glabrous; ligule 

 short ciliate; leaves 5-15 cm. long, 4-8 mm. wide, long acumi- 

 nate, nearly glabrous or scabrous on the upper surface and mar- 

 gins, generally pilose with scattered long hairs at the base; 

 spikes about 1cm. in diameter; rachis pubescent; setae 5-12 at 

 each spikelet, unequal, yellowish, 3-8 mm. long; spikelets 

 broadly ovate, 3 mm. long; palea convex at the base, concave 

 above, transversely striate. 



Occasional along streets in Los Angeles, Davidson. 



2. C. imberbis (Poir.) Scribn. Perennial; culms erect or 

 ascending, more or less csespitose, from creeping rootstocks, 

 slender, compressed, scabrous below the panicle, otherwise 

 smooth ; sheaths glabrous, the lower much longer than the inter- 

 nodes, smooth on the hyaline margins; leaves 1-3 dm. long, 3-7 

 mm. wide, long tapering to the apex, slightly scabrous on the 

 upper surface and margins; spikes 2-5 cm. long, nearly 1 cm. 

 broad ; rachis angular, pubescent, branches short, 1- or rarely 2- 

 flowered; setae 8-12, spreading, 5-10 mm. long, unequal, slender, 

 finely antrorsely scabrous; spikelets ovate, acute, 2-2.5 mm. 

 long; first glume about K~% as long as the spikelet, ovate, acute, 

 5-7-nerved ; third glume equaling the flowering glume, 5-nerved, 

 subtending a broad palea of its own length; flowering glume 

 lliptic-ovate, finely transversely rugose ; palea plane or concave 

 above. 



Frequent along irrigating ditches. Los Angeles; Santa Ana; San Ber- 

 nardino. 



