770 GRAMINE^ beomus 



ascending, 1-3 inchealong: spikelets appressed-pnbescent: empty glumea 

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

 broad, obtuse, Z}4-iyi lines long. In fields and waste places. 

 ■ VAE. GLABRBSCENS Shear U. S. Dept. Agr. Div. Agrost. Bull. 23, 20. 

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



B. BRiza:FORMis F. & M. Ind. Sem. Hort. Petrop. ili, 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 

 pr often drooping : spikelets few, >^-l 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. MA-Dritensib L. Cent. PI. i, 5. A tufted annual : sterna erect, or 

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

 the lower slightly pubescent: ligules about IJine long, subtruncate 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 1)^-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. liar. PI. Sic. 2, 8. An erect annual, 6-30 inches 

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

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

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

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

 the second broadjer and longer, prominently 3-nerved: fiowering glumes 

 5-nerved, 10-12 lines long: awn stout, 2-2J^ 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: aheatha pUbeacent: ligules J^-l 

 line long, laciniates-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-lJ^ inch long : empty glumea acuminate, smooth 

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

 and longer, 3- ner>iied ; flowering glumes 7-8 lines long, lanceolate, acute, 

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

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

 Europe. 



B. STERiLis \j. Sp. 77. Stems 13^-3 feet high, erect, smooth, from an 

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

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

 lines \yide, uaually more or lesa pubeacent: panicle 5-10 inches long, ita 

 brancl^ea ascending, or ottefl widely spreading, not one-sided, stiff: spike- 

 lets feV, 5-10-flowered) spreading or pendulous : empty glumea acuminate, 

 glabrona, the firat 1-nerved, the second longer, 3-nerved; flowering glumes 

 6-8 lines long, acuminate, 7-nerved, scabrous on the nervea: awna 7-12 

 lines long. In waste places ; introduced from Europe. 



B. 5BCT0R0M L. Sp. 77. Stems 6-21 inches high, erect, from an annu- 

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



