POACEAE. 33 



1. P. monspeliensis (L.) Desf. Annual; culms erect or genicu- 

 late, 2-5 dm. high; sheaths about equaling the nodes, the upper 

 slightly inflated; leaves flat, scabrous; panicle spike-like, oval or 

 cylindric, 3-8 cm. long, 1-2 cm. broad, pale, often yellowish-green; 

 spikelets numerous, nearly concealed by the slender awns; empty 

 glumes pubescent or ciliate, obtuse, elliptic; awns 4 mm. long; 

 flowering glume 1 mm. long, hyaline, truncate-jagged; aw^n equaling 

 or shorter than the glume or wanting; palea 2-toothed. 



Common in low moist places along the coast and along streams 

 throughout our range, ascending the mountains to the pine belt. 



2. P. littoralis Sm. Perennial, 3-6 dm. high, ascending from 

 rootstocks; sheaths nearly equaling the internodes, the upper 

 slightly inflated; leaves flat, scabrous; panicle dense, somewhat 

 lobed, 4-8 cm. long; spikelets 2-2.5 mm. long; awns equaling the 

 empty elliptic glumes; flowering glume 1 mm. long, truncate, hyaline, 

 its awn nearly twice as long; palea 2-toothed. 



Occasional along streams in the valleys and foothills. 



17. AGROSTIS L. Bent-grass. 



Annual or perennial grasses with fiat or bristle-like 

 leaves and paniculate inflorescence. Spikelets 1-flow- 

 ered. Glumes 3; the 2 outer empty, membranous, 

 keeled, acute; the third shorter, obtuse, hyaline, some- 

 times bearing a dorsal awn, subtending a perfect flower. 

 Palea shorter than the glume, sometimes minute or 

 wanting. Stamens generally 3. Styles short, distinct. 

 Grain free, enclosed in the glume. 



Palea nearly equaling the glume. 1. A. stolonifera. 

 Palea obsolete. 



Annual; flowering glume 1.5 mm. long. 2. A. exarata. 



Perennial; flowering glume 2.5-3 mm. long. 3. A. diegoensis. 



1. A. stolonifera L. Perennial from slender rootstocks; culms 

 decumbent, 3-6 dm. high, often rooting from the lower nodes; 

 sheaths inflated, smooth; leaves 5-10 cm. long, 2-6 mm. wide, 

 scabrid above; panicle loosely contracted, 4-10 cm. long, 8-12 mm. 

 wide; empty glumes nearly equal, obtuse, 1-nerved, scabrous; callus 

 naked; flowering glume 1 mm. long, 5-toothed, glabrous; palea 

 nearly equaling the glume. 



Common along streams in the mountains and valleys throughout 

 our range. Native of southern Europe. 



2. A. exarata Trin. Annual; culms erect, tufted, leafy, 3-6 dm. 

 high; sheaths minutely scabrid; leaves 7-15 cm. long, 3-5 mm. 

 wide, scabrous; panicle interrupted, lobed and dense above, 10-15 

 cm. long; branches crowded, erect; spikelets 2.5-3 mm. long; empty 

 glumes nearly equal, scabrous on the nerves; callus with a tuft of 

 minute hairs at the base of each margin of the flowering glume; 

 flowering glume 1.5 mm. long, glabrous, minutely 2-toothed at the 

 apex, awnless; palea obsolete. 



Occasional in low moist places in the coast valleys. 



