Hordeae 57 



14. B. carinatus Californicus (Nutt.) Shear. Sheaths and 

 blades nearly smooth ; flowering glumes merely scabrous, other- 

 wise 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. LEPTDRUS. 



Spikes stout; spikelets usually 2- (or more) flowered. 



Spikelets placed with one edge against the rachis. 37. LOLJUM. 



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. SlTANION. 



37. LOLIUM L. DARNEL or RAY-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. 



1. L. perenne L. (ENGLISH RAY-GRASS.) Perennial; culms 

 3-6 dm. high, erect or commonly geniculate at the base, smooth; 

 sheaths smooth; leaves scabrid on the edges and upper side; 

 spike 1-3 dm. long, bearing 6-10 spikelets; rachis smooth, chan- 

 neled; spikelets 6-8 mm. long, smooth, shining, 7-11-flowered ; 

 empty glumes strongly ribbed, much shorter than the spikelet; 



