9S 



Lepturus, R. Br. 



Spikelets one to two-flowered, single and sessile at each joint of 

 the alternately excavated rhachis of the simple spike ; outer glumes 

 persistent, rigid, narrow, acute ; flowering glumes much • shorter, 

 thin, hyaline; palet hyaline, two-nerved. 



1. L. Bolanderi, Thurb. California to Oregon. 



2. L. filiformis, Trin. Introduced from Europe. 



3. L. incurvatus, Trin. Introduced from Europe. 



Hordkcm, Linn. 



Infloresence a dense spike, with two or three spikelets at each 

 joint of the notched rhachis ; spikelets one-flowered, with an awl- 

 shaped rudiment of a second flower, the central spikelet of the clus- 

 ter perfect and sessile, the lateral ones short-stalked and imperfect 

 or abortive ; outer glumes side by side, two to each spikelet or six 

 at each joint, slender and awn-pointed or bristle form ; flowering 

 glume herbaceous, shorter, oblong or lanceolate, rounded on the 

 back, not keeled, five-nerved, acute or long awned ; palet shorter, 

 two-keeled. 



1. H. jubatum, Linn. Wild barley, Squirrel- tail grass. On the 



sea-coast, and saline soil in the interior, especially in the 

 Rocky Mountains. 



2. H. maritimnm, With. Introduced on Ballast. 



3. H. murinum, Linn. Introduced from Europe. 



Professor Brewer states that this grass, unfortunately, is exten- 

 sively naturalized in California, and is a vile pest ; it comes in when 

 land is overstocked ; is known there as " Squirrel grass," " Squirrel 

 tail," " Fox tail," and " White oats." The heads break up and the 

 barbed seeds work into the wool of sheep, and even into the flesh of 

 lambs, killing them. It damages the eyes and throats of animals. 



4. H. pratense, LLuds. 



An annual or biennial grass growing principally in alkaline soil 

 in the Western States and Territories. It is eaten by cattle when 

 in a young state, but when mature it is worthless and pestiferous on 

 account of its long, barbed awns. 



5. H. pusillum, Nutt. Same'range as the preceding. 



