40 Aveneae 



middle of the glume, 1-2 cm. long, geniculate; palea 15 mm. 

 long, hairy on the nerves. 



Very common in all the valleys and on grassy hills. Native of southern 

 Europe. 



2. A. fatua glabrescens Coss. (BASTARD OATS.) Like the 

 type except that the flowering glumes are glabrous. In this re- 

 spect resembling A. saliva L., the cultivated oat, but it is easily 

 distinguished from that by its longer and geniculate awn and 

 wide, 9-nerved flowering glume. A . saliva is awnless or has a 

 short straight awn and a 7-nerved glabrous flowering glume. 



Occasional in our valleys. San Bernardino, Parish; Inglewood. 



22. DANTHONIA DC. WILD OAT-GRASS. 



Annual or perennial grasses with flat or convolute 

 leaves and contracted or open panicles. Spikelets 3-many- 

 flowered, the flowers all perfect or the upper stami- 

 nate ; rachilla pubescent extending beyond the flowers. 

 Glumes 5 many, the 2 outer empty, keeled, acute, sub- 

 equal, persistent, generally extending beyond the upper- 

 most flowering glume ; flowering glumes rounded on the 

 back, 2-toothed, deciduous ; the awn arising from be- 

 tween the acute or awned teeth, flat and twisted at base, 

 bent. Palea hyaline, 2-keeled near the margins, obtuse 

 or 2-toothed. Stamens 3. Styles distinct. Grain free, 

 enclosed in the glume. 



1. D. Californica Boland. Perennial, tufted; culms 4-8 dm. 

 high, erect or somewhat decumbent at base; sheaths smooth, 

 villous or bearded at the summit ; blades flat or convolute, 10-15 

 cm. long, 3-5 mm. wide, scabrous; spikelets 1-5, terminal, 15-25 

 mm. long, usually purplish ; pedicels slender, spreading, minute- 

 ly hirsute ; empty glumes equaling the spikelet ; flowers usually 

 7; flowering glume about 8 mm. long, hairy on the callus and 

 margins below the middle, teeth about 2 mm. long; awn about 

 equaling the glume, scabrous. 



In dry usually stony ground. Newhall, Davidson. 



