52 POACEAE. 



long; flowering glume puberulent or short pubescent, 7-nerved, 

 13-16 mm. long, shortly 2-toothed at apex and tapering into an 

 awn 7-10 mm. long; palea nearly equaling its glume, ciliate-pectinate 

 on the keels. 



Rather common in grassy places in the lower hills and valleys. 

 Verdugo Hills; Inglewood; San Bernardino. 



13a. B. carinatus calif ornicus (Nutt.) Shear. Sheaths and 

 blades nearly smooth; flowering glumes merely scabrous, otherwise 

 as in the type. 



Occasional in the coast valleys. Ballona Creek near Mesmer. 



Tribe 8. HORDEAE. Barley Tribe. 



Spikelets 1 -flowered, usually hermaphrodite, sessile 

 along the common rachis, forming a simple or compound 

 spike. Glumes awned or awnless. 



Spikelets solitary at each joint of the rachis. 



Spikes very slender; spikelets 1-2-flowered. 38. Lepturus. 



Spikes stout; spikelets usually 2- (or more) 

 flowered. 

 Spikelets placed with one edge against the 



rachis. 37. Lolium. 



Spikelets placed with one side against the 

 rachis. 39. Agropyron, 



Spikelets 2-3 at each joint of the rachis. 



Spikelets 3 at each joint of the rachis. 40. Hordeum. 



Spikelets 2 at each joint of the rachis. 



Axis of the spike continuous; empty glumes 



entire. 41. Elymus. 



Axis of the spike articulate; empty glumes 



usually 2-many-cleft. 42. Sitanion. 



37. LOLIUM L. Darnel or Rye-grass. 



Annual or perennial grasses, with simple erect culms, 

 flat leaves and terminal spikes. Spikelets several- 

 flowered, solitary, sessile and alternate in the notches of 

 the usually continuous rachis, compressed, the edge of 

 the spikelet turned toward the rachis. Glumes rigid, 

 the first in the lateral and the 2 lower in the terminal 

 spikelets empty; flowering glumes rounded on the back, 

 5-7-flowered. Palea 2-keeled. Stamens 3. Styles dis- 

 tinct, very short; stigmas 2. Grain adherent to the 

 palea. 



Perennial: empty glume shorter than the spikelet. 

 Flowering gmme awnless or with a very short 

 awn; spikelets 5-11-flowered. 1. L. perenne. 



