620 POACE.E. 



drooiDing, 20-30 cm. long, rays scabrous, single or in pairs, 

 3-angled, the lowest remote, 10 cm. long, besides the spikelets, 

 which are few and borne above the middle. Sj)ikelets 3-6-flowered, 

 joint of rachilla 2 mm. long; first empty glume awl-shajied, 

 1-nerved, 6 mm. long, second linear-lanceolate, 3-nerved, 8-9 mm. 

 long; floral glume scabrous, lance-elliptical, obscurely 5-nerved, 8-9 

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

 15-20 mm. long; palea scabrous on the keels, lance-elliptical, 8 

 mm. long. 



Introduced from Eussia. 



18. B. ERECTUS Huds. Fl. Angl. Ed. 1, 39 (1762). B. arvensis 

 Lam. Fl. Fr. 3 : 607 (1778). B. agrestis AIL Fl. Ped. 2 : 249 (1785). 

 B. asper Pall. Ind. Taur. ex Bieb. Fl. Taur. Cauc. 1:73 (1808). 

 B. angustifoUus Schrank, Baier. Fl. 1:366 (1811). Bromopsis 

 ereda^om-n. Ann. Soc. Linn. Lyon, N. S. 17:187 (1869). 



An erect glaucous-green jDcrennial, 30-60 cm. high, from short, 

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

 pubescent; ligule a mere callus or ring; blades thinly jjubescent, 

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

 the culm 4 in number, 10-15 cm. long, 2-3 mm. wide. Panicle 

 strict, linear, 10-12 cm. long, 2-3 cm. wide, rays scabrous, in twos 

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

 on short pedicels. Spikelets linear, often tinged with purple, 6-10- 

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

 1-nerved, 7-9 mm. long, second linear-lanceolate, 3-nerved. 9-10 

 mm. long; floral glume scabrid, lance-oval, 5-nerved, 10-12 mm. 

 long, including the 2 hyaline points, awn 5 mm. long; palea 

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



Vermont, Pringle for U. S. Dept. Agricul. 738 ; Mississippi, 

 Tracy; CcJifornia, Jones 3270. 



Introduced from Europe. 



19. B. TECTORUM L. Sp. PI. 77 (1753). B. avenaceus Lam. 

 Illustr. 1:194 (1791). B. ahortiflorns St. Amans, Fl. Agen. 44 

 (1811). Anisantha 2)ontic(t C. Koch, Linna?a 21:394 (1848). 



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

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



