70 GRAMINEA bromus 



ascending, 1-3 inches long: spikelets appressed- pubescent: empty glumes 

 acute, the first 3-nerved, the second longer, 5-7-nerved: flowering glumes 

 broad, obtuse, Z%-\% lines long. In fields and waste places. 



var. glabrescens Shear U. S. Dept. Agr. Div. Agrost. Bull. 23, 20. 

 Spikelets glabrous or only scabrous throughout. In fields and waste places. 



B. briz^formis F. & M. Ind. Sem. Hort. Petrop. iii, 30. Stems 8-24 

 inches high, erect, glabrous; sheaths shorter than the internodes : the 

 lower pubescent with soft villous hairs: ligules 1 line long, erose-truncate : 

 leaves pubescent: panicle 1-8 inches long, open, the branches ascending 

 or often drooping: spikelets few, %-\ inch long, compressed : empty glumes 

 very obtuse, the first 3-5 nerved, the second larger, 5-9-nerved : flowering 

 glumes, 3-4 lines long, very broad, obtuse, 6-nerved, not awned. In fields 

 and waste places. 



§ 2 stenobromus Griseb. Annuals or biennials with mostly 

 narrow glumes and rather long awns. 



B. Madritensis L. Cent. PI. i, 5. A tufted annual : stems erect, or 

 somewhat geniculate at base, smooth, 1-2 feet high, : sheaths smooth, or 

 the lower slightly pubescent: ligules about 1 line long, eubtruncate and 

 acerate: leaves 2-7 inches long, 1-2 lines wide: panicle erect, 2-6 inches 

 long, oblong-ovoid, the lower branches somewhat spreading, 6-12 lines 

 long: spikelets 1K-2 inches long, nearly smooth to scabrous, 7-11-flowered: 

 empty glumes lanceolate, acuminate, the first 1-nerved, 5-7 lines long, the 

 second 3-nerved, 7-8 lines long: flowering glumes linear-lanceolate 7-9 lines 

 long, distinctly 3- or faintly 5-7-nerved, with 2 acute, hyaline teeth, bear- 

 ing a long rough somewhat curved awn. Southern Oregon to California, 

 naturalized from Europe. 



B. Gossoni Pari. Ear. PI. Sic. 2, 8. An erect annual, 6-30 inches 

 high : sheaths pilose-pubescent : ligules 1-2 lines long, rounded above : 

 leaves pilose both sides: panicle lax, 4-8 inches long, the upper part some- 

 what drooping : spikelets usually 3-7-flowered, 4-6 lines long : empty glumes 

 smooth, lanceolate acuminate, the first 8-10 lines long, strongly 1-nerved, 

 the second broader and longer, prominently 3-nerved : flowering glumes 

 5-nerved, 10-12 lines long: awn stout, 2-2^ inches long, very rough. In 

 waste places, Washington to California and Arizona. 



B. rubens L. Cent. PI. i; 5. A tufted annual : stems about 10 inches 

 high, erect, pubescent toward the top: sheaths pubescent: ligules %-\ 

 line long, laciniate-dentate : leaves 2-7 inches long, pubescent both sides: 

 panicle erect, compact, ovoid, usually purplish, 2-4 inches long: spikelets 

 mostly 7-11-flowered, 1-1*4 inch long: empty glumes acuminate, smooth 

 to scabrous, the first narrow, 1-nerved, 3-5 lines long; the second broader 

 and longer, 3-nerved; flowering glumes 7-8 lines long, lanceolate, acute, 

 5-nerved, scabrous, deeply cleft at the apex into 2 long-acuminate hyaline 

 teeth: awns straight, 8-12 lines long. In waste places : introduced from 

 Europe. 



B. sterilis L. So. 77. Stems 13^-3 feet high, erect, smooth, from an 

 annual or biennial root: sheaths usually shorter than the internodes, the 

 lower sometimes pubescent: ligules 1 line long: leaves 3-9 inches long, 1-3 

 lines wide, usually more or less pubescent: panicle 5-10 inches long, its 

 branches ascending, or often widely spreading, not one-sided, stiff: spike- 

 lets few, 5-10-flowered, spreading or pendulous : empty glumes acuminate, 

 glabrous, the first 1-nerved, the second longer, 3-nerved; flowering glumes 

 6-8 lines long, acuminate, 7-nerved, scabrous on the nerves: awns 7-12 

 lines long. In waste places; introduced from Europe. 



B. tectorUxM L. Sp. 77. Stems 6-24 inches high, erect, from an annu- 

 al root, simple, smooth : sheaths usually exceeding the internodes, at least 



