620 i'.)A« i;.K. 



(lr()0[)ing, 20-30 cm. long, nivrt Kcuibrous, nlnglc or in pairs, 

 8-imgl»'(l, tliu lowest rcniotc. 10 cm. long, lu'sidcs tlio spikdcta, 

 which uro few and liorno ubovcithc middle. S[»ikelets ll-r.-llowercd, 

 joint ol" riichillii 'i mm. long; lirst empty glume iiwl-sliaped. 

 l-nerved, (i mm. long, second linear-laneeolute, ;j-neived, 8-1) mm. 

 long; lloral glume wabrons, lance-elliptical, obscurely r)-nerved. S-!) 

 mm. long, including two very short hyaline points, awn slender, 

 15-;iO mm. long; paluii scubroua on tlio kecU, laucu-uUiptical, H 



mm. long. 



Introduced from liussia. 



IS. B. KHK.rris lluds. Fl. Angl. Ed. 1, 30 (1702). //. aririisis 

 Lam. Fl. Fr. 3 : 007 (1778). 7,'. (t(/rvsf,\s All. Fl. IVd. 2 : "AU ( 1 ; sr,). 

 Ji. asjwr I'all. Ind. Taur. ex l»eb. Fl. Taur. Cauc. 1:73 (1808). 

 li. (Oii/iis/ifoliiis Schrank, Baier. Fl. 1 : 3(50 (1811). /Iro/im/isis 

 crecia Fourn. Ann. Soc. Linn. Lyon, ^'. S. 17:187 (18(19). 



An erect glaucous-green perennial, 30-(J0 cm. high, from short, 

 stout rootstocks. Sheaths two-thirds as long as the internodes. 

 pubescent; ligulo tt mere callus or ring; blades thiidy pubescent, 

 narrow, involute, those of the sterile shoots 30 cm. long, those of 

 the culm '■ in number, 10-15 cm. long, 2-3 mm. wide. I'aiucle 

 strict, linear, 10-12 (!m. long, 2-3 cm. wide, rays sciibious, in twos 

 and threes, the longest 3-5 cm. long, bearing 2-3 spikelets, mostly 

 on ! hort i)edicols. Spikelets linear, often tinged with purple. ()-10. 

 flowered, joint of rachilla 3 mm. long; first glume lanceolate, 

 l-nerved, 7-9 mm. long, second linear-hmceolate, 3-nerved, 9-10 

 mm. long; lloral glume scabrid, lant!e-oval, 5-nerved, 10-12 mm. 

 long, in(^luding the 2 hyaline jjoints, awn 5 mm. long; palea 

 linear, ciliate on the keels, 10 mm. long. 



Vermont, Pringle for TJ. S. Dept. Agricul. 738; Mississipi)i, 

 Tracy; California, Jones 3270. 



Introduced from Euro})e. 



19. li. TKCTOKUM L. Sp. ri. 77 (1753). B. avenaceus Lam. 

 Illustr. J : 194 (1791). B. abort ijlonis St. Amans, Fl. Agen. 44 

 (1811). AnUanfhaiJontim C. Koch, Linmea 21: 394 (1848). 



A rather soft and slender perennial, 20-70 cm. high. Sheaths 

 pubescent, shorter than the internodes; ligule very short; blades 4 



