772 GRAMINE^E BROMUS 



ennial : stems smooth : or pubescent just below the nodes, 2-3 feet high : 

 sheaths smooth : ligules about ^ line long, truncate, dentate : leaves usually 

 5 or 6, 4-8 inches long, 5-6 lines wide, rather abruptly acuminate, firm and 

 smooth ; panicle narrow, erect, rather dense, 3-8 inches long, its branches 

 erect, or ascending, the longest 1-2 inches long : spikelets 5-9-flowered, 1- 

 1% inches long, terete at first : empty glumes glabrous, or scabrous on the 

 nerves the first acuminate- lanceolate, 1-nerved, or sometimes with a pair 

 of short lateral nerves, '5-6 lines long; the second broader, subacute, 3- 

 nerved, 6-7 lines long: flowering glumes oblong-lanceolate subacute, 7-8 

 lines long, 5 or 7-nerved, appressed-pubescent near the base, emarginate 

 at the apex : awn 1-2 lines long : palets about % as long as the glumes. 

 In open places on the high mountains, Washington to California. 



B. INERMIS Leyss. Fl. Hal. 16. An erect smooth perennial: stems 

 rather stout, smooth, 2-3 feet high : sheaths smooth : ligules 3^-1 line long, 

 subtruncate, somewhat lacerate: leaves smooth or minutely scabrous, 6-10 

 inches long, 2-6 lines wide : panicle, 5-10 inches long: spikelets narrow, 

 terete, 1-1^ inches long; empty glumes smooth, the first narrow, acute, 

 1-nerved 2-2> lines long; the second subacuminate, 3-nerved, 3-4 lines 

 long: flowering glumes obtuse, emarginate, 5-nerved, 6-7 lines long: glab- 

 rous, with or without a short awn: palet equalling the glumes. In fields 

 and waste places : introduced from Furope. 



3 CERATOCHLOA Beauv. as genus. Spikelets large, strongly 

 compressed and more or less keeled. 



B. marginatns Nees in Steud. Syn. PI. Gram. 322. B. breviarista- 

 tus Buckley. A densely tufted coarse perennial : stems erect ; 2-4 feet high, 

 mostly pubescent or puberulent : sheaths pilose-pubescent: ligules 1)^-2 

 lines long, laciniate : leaves somewhat sparsely pilose throughout, rather 

 rough 6-12 inches long, 3-6 lines wide: panicle erect, rather narrow, usually 

 4-8 inches long, the lower branches somewhat spreading in flower, 1-33^ 

 inches long : bearing 2 spikelets: spikelets 1-2 inches long, lateral compress- 

 ed, usually 7-9-flowered, erect or ascending : empty glume rather broad, 

 scabrous, the first subacute, 3- or 5-nerved, 4-6 lines long, the second 

 broader, obtuse, 6-7 lines long, 5 -7-nerved, the lateral nerves broad; flow- 

 ering glumes ovate-lanceolate, acute, coarsely pubescent, 6-8 lines long, 

 7-nerved, with short hyaline, teeth at the apex: and a stout straight awn 

 2-3 lines long : palets almost equalling the glumes. Common from Cali- 

 fornia to Alaska and the Rocky Mountains. 



Var. latior Shear. 1. c. 55 Larger and stouter : panicle larger with 

 the lower branches 2-10 inches long, with the type. 



Var. seminudus Shear 1. c. 55. More leafy and less pubescent or 

 nearly smooth, throughout: empty glumes glabrous or scabrous on the 

 nerves. With the type. 



B. polyanthus Scribn. & Shear 1. c. 56. A rathes stout erect perennial : 

 stems erect, smooth, or puberulent at the nodes, 2-3 feet high: sheaths smooth, 

 or sparsely pilose : ligules about 1 line long, rounded : leaves mostly scab- 

 rous : panicle elongated, erect, its branches usually short and erect or slight- 

 ly spreading ; spikelets l%-2 inches long, 7-11-flowered : empty glumes 

 broad, smooth or somewhat scabrous, the first 3-nerved, 3-4 lines long, the 

 second 4-7-nerved, obtuse, 6-6)^ lines long: flowering glumes 7-nerved, 6-9 

 lines long, smooth or scabrous, obtuse, emarginate, with broad hyaline 

 margins : awn 2-4 lines long. Washington to California and Wyoming. 



B. Sitchensis Bong. Veg. Sitch. 173. Stems stout, leafy, smooth, 4-6 

 feet high; from a perennial root : sheaths shorter than the internodes, 

 smooth : ligules large, rounded, entire or somewhat lacerate, l>-2> lines 

 long : leaves 8-16 inches long, 5-7 lines wide, sparingly pilose above, 

 smooth beneath: panicle large, lax, drooping, 10-14 inches long: its lower 



