24 POACEAE. 



second and third glumes a little more than 2 mm. long, awnless, 

 5-nerved, hispid on the nerves, the fourth cuspidate. 



Occasional along irrigating ditches and in waste places about Los 

 Angeles and Santa Ana. 



3. P. capillare L. Culms erect or decumbent, 3-6 dm, high, 

 simple or sparingly branched; sheaths papillose-hirsute; leaves 

 15-30 cm. long, 6-15 mm. wide, more or less pubescent; terminal 

 panicle usually 2-4 dm. long, lower branches exserted and widely 

 spreading, 1-2 dm. long; spikelets 2-2.5 mm. long, acuminate; first 

 glume j-^ as long as the spikelet; second and third glumes nearly 

 equal, acute, the fourth 1.5 mm. long. 



Occasional along irrigating ditches and in neglected orchards and 

 gardens. 



4. P. pacificum Hitch. & Chase. Culms simple and erect, be- 

 coming profuse with age; sheaths hirsute to villous, often papillose; 

 leaves usually rounded or truncate at the base, pubescent or glabrate, 

 those of the culms 4-6 cm. long, those of the branches much shorter; 

 terminal panicles less than 8 cm. long, ovoid, their branches ascend- 

 ing; lateral panicles much shorter, not exceeding the leaves; spikelets 

 scarcely 2 mm. long, pubescent. 



San Jacinto Mountains, Hall; Glenn Ranch, Lytle Creek Canyon. 



6. SETARIA Beauv. 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. S, glauca (L.) Beauv. An erect or ascending csespitose 

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

 pressed, glabrous; nodes smooth; sheaths glabrous; ligule short 

 ciliate; leaves 5-15 cm. long, 4-8 mm, wide, long acuminate, nearly 

 glabrous or scabrous on the upper surface and margins, generally 

 pilose with scattered long hairs at the base; spikes about 1 cm. 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. S. imberbis (Poir.) R. & S. Perennial; culms erect or ascend- 

 ing, more or less caespitose, from creeping rootstocks, slender, com- 

 pressed, scabrous below the panicle, otherwise smooth; sheaths 

 glabrous, the lower much longer than the internodes, smooth on 

 the hyaline margins; leaves 1-3 dm. long, 3-7 mm. wide, long 



