40 POACEAE. 



Flowering glumes usu- 

 ally awned just be- 

 low the entire or 2- 

 toothed apex, 36. Bromus. 



Flowering glumes compressed or 

 keeled. 

 Spikelets nearly sessile in 

 dense 1-sided clusters at the 

 ends of the few panicled 

 branches. 31. Dactylis. 



Spikelets not in dense i -sided 

 clusters. 

 Spikelets 1-2 cm. long; 



glumes short-awned. 36. Bromus. 



Spikelets smaller; glumes 



awnless. 34. Poa. 



26. MONANTHOCHLOE Engelm. 



A creeping or stolonlferous grass with stout rigid 

 crowded leaves. Spikelets 2-3-flowered, unisexual, some- 

 what unlike, usually sessile in 4's and concealed within 

 the leaf fascicles, the upper floral leaves becoming smaller, 

 at length reduced to sheaths and resembling the outer 

 glumes. Flowering glumes membranous, rigid, obtuse or 

 denticulate. Palea 2-nerved, included within the flower- 

 ing glume. Stamens in the staminate plants 3. Styles 

 in the pistillate plants distinct, elongated; stigmas bar- 

 bellate. Grain free, included within the glume and 

 palea. 



1. M. littoralis Engelm. Culms firm, creeping or ascending; 

 leaves crowded, subulate, usually about 1 cm. long, conduplicate; 

 flowering glumes 9-1 2-nerved. 



Occasional on salt marshes along the coast. San Pedro; San 

 Diego. 



Arundo donax L. (Giant- Reed.) A tall reed-like grass with 

 hollow culms, broad flat leaves and ample terminal panicles. Intro- 

 duced from southern Europe and cultivated for ornament, some- 

 times found as an escape. 



Gynerium argentium Nees. (Pampas-grass.) Tall reed-like 

 grass with solid culms, long narrow leaves and large showy plumose 

 panicles. Introduced from South America and cultivated for orna- 

 ment. 



27. ERAGROSTIS Beauv. 



Annual or perennial grasses with flat leaves and con- 

 tracted or open panicles. Spikelets 2-many-flowered, 

 more or less flattened. Glumes 4-many; the 2 outer 



