614 POACE.E. 



Slieaths smootli or densely ciliate, eiliutc at the tliroat ; ligule 1-2 mm. 

 long; blades of the culm 3—4 in number, smooth or scabrid or thinly 

 pubescent, 15-25 cm. long, 4-G n)m. wide. Panicle simple, very 

 variable, rays erect or the lower spreading, iry-'M) cm. long, rays in 

 threes, fours, or fives, or tlie lowest and tliose above in twos, the 

 longest bearing 2-4 spilvek'ts. Sjjikelets compressed, linear or oval- 

 lanceolate, G-10-llowercd, longest joint of racliilla 5 mm. long; 

 empty glumes sn)ootli, comi)res8i'(l, oval-lanceolate, acute, first 5- 

 nerved, ll-ll) mm. long, second T-9-nerved, lo-ll mm. long; floral 

 glume oval-lanceolate, conduplicate, scabrous or i)ubescent, 9- 

 uerved, 15-17 mm. long, awn 5-12 mm. long, starting below the 

 entire apex of its glume; palea linear, 13 mm. long, finely pecti- 

 nate-ciliate. 



Wyoming, 7>//^'?/m 10;*; Washington, *S'//^.s7/o/7; Oregon, JIowelL 



British America to California. 



Var. minor Scribn. Macoun. Cat. 4:238 (1888). 



Leaves finely pubescent, blades scarcely 3 mm. wide; panicle 

 thin, slender, with few si)ikelets. 



Arizona and Oregon. 



!». B. segetum II. B. K. Nov. Gen. et Sp. 1 : 153 (1815). 



Annual; culms simple, erect, glabrous, 80-120 cm. high. 

 Sheaths about the length of the internodes; ligule 2 mm. long; 

 blades 4 in number, flat, scabrous, 15-20 cm. long, 3-7 mm. wide. 

 Panicle simple, secund, nodding, about 30 cm. long, axis and 

 rays scabrous, the lowest half-whorl of rays 5 in luimber, the next 

 above fewer, 8-9 cm. distant, the longest 13-15 cm. long, bear- 

 ing about 3 spikclets near the apex. Spikelets scabrous, com- 

 pressed, linear-oblong, nearly 3 cm. long, 3-10-flowered, joint of 

 racliilla 2 nun. long, empty glumes linear-lanceolate, compressed, 

 first 5-nerved, about 10 mm. long, second 7-nerved and about 12 

 mm. long; floral glume ovul-lanceolate, 7-nerved, about 14 mm. 

 long to the acute single joint, awn 5 mm. long, more or less; palea 

 concealed in the conduplicate grain. 



Introduced into California from Mexico and South America. 



10. B. brrbatoides, I'rmtnm harhatum Steud. Syn. PI. Gram. 

 229 (1855). 



