POACEAE. 



39 



lacerate-toothed ; leaves 5-18 cm, long, 2-6 mm. wide, scabrous; 

 spikes numerous, slender, rigid, ascending or sometimes spreading, 

 the lower 5-15 cm. long; spikelets usually 3-flowered, about 2 mm. 

 long; empty glumes shorter than the spikelets, acute, 1-nerved, 

 slightly scabrous on the keel; flowering glumes 2-toothed at the 

 apex, ciliate on the nerves. 



Common in the San Joaquin Valley and at Imperial along irri- 

 gating canals. Known within our limits only from near Santa 

 Monica, Davidson. 



Tribe 7. FESTUCEAE. Fescue Tribe. 



Spikelets 2-many-flowered, usually hermaphrodite, 

 pedicellate in racemes or panicles, the latter sometimes 

 dense and spike-like. Flowering glumes usually larger 

 than the empty glumes, awnless or with 1-several 

 straight, rarely bent, awns, which are either terminal or 

 borne just below the apex. 



Spikelets of 2 kinds in the same inflorescence, 

 hermaphrodite and sterile. 

 Fertile spikelets 2-3-flowered, awnless. 

 Fertile spikelets 1-flowered, long awned. 

 Spikelets all alike in the same inflorescence. 

 Plants dioecious, saline or maritime. 



Spikelets solitary, concealed in the 

 axils of the crowded short and 

 rigid leaves. 

 Spikelets in exserted spike-like pani- 

 cles. 

 Plants not dioecious. 



Flowering glumes 1-3-nerved or nerve- 

 less. 

 Annual; inflorescence a lax panicle. 

 Perennial; inflorescence a spike- 

 like panicle. 

 Flowering glumes 5-many-nerved. 

 Flowering glumes rounded on the 

 back. 

 Nerves of the flowering glumes 



prominent. 

 Nerves of the flowering glumes 

 obscure or manifest only 

 near the apex. 

 Flowering glumes obtuse 



and awnless. 

 Flowering glumes acute, 

 often awned. 

 Flowering glumes en- 

 tire, acute or awned 

 from the apex. 



27. 



28. 



Cynosurus, 

 Lamarckia. 



MONANTHOCHLOE. 

 DiSTICHLIS. 



Eragrostis. 

 koeleria. 



29. AIelica. 



34. PoA. 



35. Festuca. 



