GRAMINACEAE (GRASS FAMILY) 43 



C. Panicle dense, 5-12 cm. long; plant 1.5-6 dm. high; spikelets 5-6 mm. long. 



^- C. E. X. spicatum (narrow false oat) 



CC. Panicle not dense, 12-20 cm. long; plants 3-12 dm. high; spikelets 6-8 mm. 



long. 



D. Leaf sheath glabrous; lemma s-6 mm. long, awn arising below the cleft. 



^- *-•■ ^- T. cernuum (nodding false oat) 



DD. Leaf sheath' pubescent; lemma 6-7 mm. long, awn arising at the cleft. 



*• ^- ^- T. canescens (silvery false oat) 



DANTHONIA (Oat-grass) 



Spikelets solitary or in a raceme or panicle. Glumes narrow, keeled, 

 acute, awnless, usually as long as the spikelet. Lemma rounded on the 

 back, awned, with 2 firm scarious terminal lobes ; awn twisted, bent, arising 

 between the lobes. Grain glabrous, free. — (Honor of Etienne Danthoine, 

 a French botanist.) The ist and 3rd are good range grasses. 



A. Spikelets in a narrow close panicle, ascending. 



B. Callus elongate, densely hairy. W. C. E. D. Intermedia (smaller oat-grass) 

 BB. Callus very short, with a few short hairs. W. E. D. pinetorum 



AA. Spikelets solitary or spreading in a loose panicle. 



C. Spikelets 3-10; leaf sheath only slightly hairy; apex of lemma with 2 teeth 2-3 

 mm. long. E. D. califomlca (California oat-grass) 



CC. Spikelets 1-4; leaf sheath quite hairy; apex of lemma with 2 awl-like teeth 

 3-10 mm. long. 

 D. Spikelets usually 2-4; lemma abruptly narrowed, 6-8 mm. long. W. C. 



D. amerlcana 

 DD. Spikelets usually only r; lemma not abruptly narrowed, 8-10 mm. long. E. 



D. unlspicata (mountain oat-grass) 



AVENA (Oats) 



Annual or perennial. Spikelets few-flowered, rarely i-flowered, in a loose 

 panicle; rachiUa hairy under the lemma. Glumes scarious at least at the 

 apex, lanceolate, nearly equal. Lemma smaller than the glumes, rounded 

 on the back, 5— ii-veined, 2-cleft at the apex, awned; awn dorsal, twisted. 

 Palet narrow, 2-toothed. Stamens 3. Grain deeply grooved. — (The Latin 

 name.) 



A. Lemma awn 2-4 cjp. long, abruptly bent near the middle, arising near middle of 



lemma. W. E. — Sometimes cut for hay. A. fatua (wild oats) 



AA. Lemma awn 2 cm. or less long, not or hardly abruptly bent, arising | way up 



lemma. 



B. Annual; spikelets 20-25 mm. long, 2-3-flowered; glumes 9-11-veined. W. E. 



— This is common cultivated oats, one of our best grain crops. A. sativa (oats) 



BB. Perennial; spikelets 10-15 mm. long, 3-6-flowered; glumes 3-5 -veined. E. 



A. striata (perennial oats) 



FESTUCEAE (Blue-grass Tribe). — Inflorescence a panicle, spikelike 

 or spreading. Spikelets 2- to many-flowered, very rarely i-flowered ; glumes 

 keeled, acuminate to obtuse, shorter than the first lemma. Lemma entire 

 to 3-cleft, awnless; awns terminal, rarely dorsal. . Palet 2-keeled. 



