GRASS fa:\iily 



247 



^ 6. Hordeum caespitosum Scribn. 

 Tufted Barley. Fig. 586. 



Iloidciim cacsfitosum Scribn. Proc. Davenport Acad. 7: 

 245. 1899. 



Differs from H. jubatum chiefly in the shorter 

 awns, about 2 cm. long. 



Plains and alkali meadows, in the Arid Transition Zone; 

 eastern Washington and Oregon to South Dakota.' June- 

 July. Type locality: Edgemont, South Dakota. 



7. Hordeum boreale Scribn. & Smith. 

 Northern Barley. Fig. 587. 



Hordeum boreale Scribn. & Smith, U. S. Dept. Agr. Div. 

 Agrost. Bull. 4: 24. 1897. 



Perennial ; culms erect, smooth, 60-100 cm. tall ; 

 sheaths smooth ; blades 5-10 cm. long, 4-6 mm. 

 wide ; spikes 5-8 cm. long ; glumes setaceous, sca- 

 brous 1.5-2 cm. long; floret of central spikelet 

 sessile, 1 cm. long, smooth below, the awn about 1 

 cm. long; floret of lateral spikelets pedicellate, as 

 large as the central or smaller. 



Along the coast, Alaska to Oregon (Gearhart, Chase) 

 and California (Bucksport, Tracy; Fort Bragg, Hitchcock). 

 July. Type locality: Atka Island, Aleutian Islands. 



8. Hordeum nodosum L. 

 Meadow Barley. Fig. 588. 



Hordeum nodosum L. Sp. PI. ed. 2. 1: 126. 1762. 



Perennial ; culms erect or sometimes spreading, 

 10-50 cm. tall ; spike slender, 2-8 cm. long ; glumes 

 all setaceous, 8-15 mm. long; floret of lateral spike- 

 lets much reduced, similar to H. pusillitiii but with 

 setaceous glumes. 



Open ground and meadows, in the Transition Zone; Alaska 

 to California, east to Indiana. May-July. Tyi)e locality, 

 European. 



76. ELYMUS L. Sp. PI. 83. 1753. 



Spikelets 2-6-flowercd, sessile in pairs (rarely in groups of 3 or more), at each node 

 of a continuous rachis, the rachilla disarticulating above the glumes and between the 

 florets ; glumes equal, usually rigid, sometimes indurate below, narrow, sometimes subulate, 

 one- to several-nerved, acute to aristate, somewhat unsymmetric. often placed in front of the 

 spikelets ; lemmas rounded on the back or nearly terete, obscurely 5-nerved. acute or usu- 

 ally awned from the tip. Erect usually rather tall grasses with flat or rarely convolute 

 blades, and terminal spikes, the spikelets usually crowded, sometimes somewhat distant. 

 [Greek, an ancient name for a kind of millet.] 



