festcjca GR AMINES 769 



BROMUS 



feet high: panicle 5-7 inches long, interrupted, more or less pubescent through- 

 out: spikelets 5-8-f lowered: second glume oblong, abruptly acute, flowering 

 glumes oval, acute: palets linear, acute, longer than the glumes. Oregon. 



Var. littoralis Vasey, Beal 1. c. Smooth and glaucous : stems 5-10 

 inches high, from creeping rootstocks: pauicle dense, secund, 2-3 inches long: 

 spikelets usually 5-flowered, the second glume ovate-lanceolate, 3-nerved, flower- 

 ing glumes oval, acute: awns %-\ line long. On sand banks along the coast of 

 Oregon. 



F. heterophylla Lam. Fl. Fr. ed. 1, 600. A densely cespitose per 

 ennial: stems slender, 2-3 feet high: sheaths smooth: leaves smooth, soft, con 

 volute, those of the stem usually 3, flat: panicle 3-8 inches long, lax, nodding 

 its branches in twos or threes: spikelets linear-oblong, 3-6-flowered: empty 

 glumes unequal, very acute, the second subulate-lanceolate, 3-nerved; the lateral 

 nerves short: flowering glumes linear-lanceolate, 3-4 lines long, very acute: awns 

 half as long as the glumes or longer: palets linear-oblong. Washington to 

 Brit. Columbia and Michigan. 



49 BROMUS L. Sp. 76. 



Annual or perennial grasses with flat leaves and numerous 

 spikelets in terminal panicles, the pedicels thickened at the sum- 

 mit. Spikelets few to many-flowered, the two lower glumes emp- 

 ty, unequal, acute: flowering glumes rounded on the back, or 

 sometimes compressed-keeled, 5-9-nerved, the apex usually 2- 

 toothed, generally bearing an awn just below the summit. Palet 

 shorter than the glumes. 2-keeled. Stamens usually 3. Stigmas 

 sessile, plumose, inserted below a hairy cushion-like appendage 

 at the top of the ovary. Grain adherent to the palet.. 



§ 1 eubromus Annuals or biennials with empty glumes 

 rather broad and flowering glumes broadly elliptic to oblong- 

 elliptic. All introduced from Europe. 



B. secalinus L. Sp. 76. Stems 1-3 feet high, erect, smooth: sheaths 

 usually shorter than the internodes: ligules^ line long, erose leaves 2-6 inches 

 long, 1-3 lines wide, sometimes rough or hairy: panicle open, its branches 

 ascending or drooping: spikelets turgid, glabrous, 6-10-flowered: empty glumes 

 scabrous toward the apex, the first 3-nerved, acute, second longer and broader, 

 7-nerved, obtuse: flowering glumes 3-4 lines long, broad, obtuse, rough toward 

 the apex, awnless or bearing a straight awn between the obtuse teeth: palets 

 about equalling the glu mes. Common in fields everywhere, 



B. racemosus L. Sp. ed. 2, 144. Stems erect, 1-3 feet high, smooth, 

 or sparingly pubescent below the panicle: sheaths shorter than the internodes: 

 ligules 1 line long: leaves 1-9 inches long, 3^-4 lines wide, pubescent: panicle 

 1-10 inches long, its branches erect or ascending: spikelets erect, 5-11 -flower- 

 ed: empty glumes acute, the first 3-nerved, the second longer and broader, 5-9- 

 nerved; flowering glumes broad, 3)^-4)^ lines long, obtuse, smooth and shining, 

 the nerves prominent: awns straight, 3-4 lines long: palets shorter than the 

 glumes. Common in meadows and waste places, 



var. commutator Hook. f. Steud. Fl. Brit. lsl. 451. Panicle rather 

 broader: spikelets larger, Common in waste places. 



B. hordeaceous L. Sp. 77. B. mollis L. Stems 8-36 inches long, 

 erect, often slender, usually pubescent below the panicle: sheaths shorter than 

 the internodes, mostly pubescent: ligules % line long: leaves 1-7 inches long, 

 1-3 lines wide, pubescent: panicle generally contracted, its branches erect or 



