POACEAE. 51 



7-9-flowered; lemma rough-pubescent, 11-14 mm. long, 2-toothed at apex, 

 and bearing a stout awn 4-7 mm. long. 

 A variable species, rare in our limits. 



Bromus sitchensis Bong. Stout grass, 1-1.5 m. high, smooth or nearly so; 

 panicle large, loose, drooping, 25-35 cm. long; lemma smooth or scabrous, 

 12-14 mm. long. 



Moist banks, along the seashore. 



Bromus hookerianus (Thurb.) Shear. Much like B. sitchensis but smaller; 

 panicle erect, the branches not drooping; lemmas scabrous. 

 In open places, common. 



Bromus vulgaris eximius Shear. Perennial; stems slender, 80-100 cm. 

 tall; leaf blades 15-25 cm. long, glabrous or sparsely pilose; sheaths pilose 

 with spreading or reflexed hairs; ligule truncate, fringed, 3-5 mm. long; 

 panicle sparse, more or less nodding, 8-12 cm. long; spikelets 2-3 cm. long, 

 2-4 mm. wide; lemma 8-10 mm. long, sparsely pubescent on the back, some- 

 what ciliate on the margin, the awn 6-9 mm. long. 



Common in open woods. 



Bromus vulgaris robustus Shear. Lemma pilose on the keel and margins 

 near the base; leaves and leaf sheaths pubescent. 

 Infrequent. 



Bromus pacificus Shear. Stems stout, about 1 m. tall; leaf-blades large, 

 8-11 mm. broad; panicle large, drooping; lemmas pubescent, 11-12 mm. long. 

 Moist banks and copses, especially along the coast. 



Bromus richardsonii pallidus (Hook.) Shear. Stems 60-120 cm. high; 

 leaf blades broad, scabrous above, smooth beneath; panicle large, loose, droop- 

 ing; spikelets pale, 6-11 -flowered, 2-3 cm. long; lemma 12-15 mm. long, villous 

 at the margins of the lower half. 



In mountain bogs, rare in our limits. 



Bromus tectorum nudum Klett & Richter. Annual; stems 30-60 cm. 

 high; leaf blades pubescent; panicle loose, one-sided, drooping, the branches 

 slender; spikelets 15-20 mm. long; glumes acute, the lower about half the 

 length of the upper; lemma lanceolate, smooth, 11-13 mm. long, bearing at 

 the apex two narrow hyaline teeth and a straight awn 13-15 mm. long. 



Introduced from Europe. Seattle, Piper. Typical B. tectorum with the 

 lemma scabrous to pubescent occurs at Puyallup, Washington. 



Bromus maximus Desf. Stems 20-40 cm. high; sheaths and blades 

 pilose; panicle erect, 5-10 cm. long, somewhat one-sided, the branches rather 

 short and erect or nearly so after flowering. 



Sparingly introduced from Europe. 



Bromus rubens L. Annual, tufted; stems 20-50 cm. high, erect; sheaths 

 and leaf blades pubescent; panicle ovoid, compact, 4-7 cm. long, reddish at 

 maturity; spikelets 7-11-flowered, 2-2.5 cm. long; glumes narrow, acuminate, 

 subequal, lower 1-nerved, upper 3-nerved; lemma lanceolate, pubescent, 

 13-16 mm. long, the apex cleft into two long hyaline teeth; awn straight, 

 18-22 mm. long. 



Introduced from Europe. 



Bromus sterilis L. Annual, the stout stems 50-100 cm. high, usually 

 decumbent at base; panicle 10-20 cm. long, loose and drooping, its branches 

 in whorls of 2-6, long and slender, usually bearing but one spikelet; spikelets 

 drooping, 2.5-3.5 cm. long, 5-10-flowercd; lemma narrowly lanceolate, 17-20 

 mm. long, bearing a stout rough awn, 20-30 mm. long. 



Introduced from Europe. 



