Hordeae 57 



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

 blades nearly smooth; flowering glumes merely scabrous, other- 



w ise as in ihr type. 



Occasional in the coast valleys. Ballona Creeh near Mesmer. 



Tribe 8. EORDEAE. Barley Tribe. 



Spikelets 1-flowered, usually hermaphrodite, sessile 

 along the common rachis, forminga simple or compound 

 spike ( ! Lumes awned or awnless. 



Spikelets solitary al each joint of the rachis. 



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



Spikes stoul ; spikelets usually ~>- (or more) flowered. 



Spikelets placed with one edge against the rachis. 37. Lot.icm. 



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 giumes entire. 41. Elymus. 



Axis of the spike articulate; empty glumes usually 2-many-cleft. 



-i-i. SlTANION. 



37. JLOLIUM 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 hack, 

 5-7-flowered. Palea 2-keeled. Stamens .">. Styles dis- 

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

 palea. 



1. JL. perenne L. (English Ray-grass.) Perennial; culms 

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

 sheaths smooth; leaves scahrid 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, 7-1 1-flowered ; 

 empty glumes strongly ribbed, much shorter than the spikelet; 



