Flora of the Palouse Region 29 



awn 3-4 111111. long. In moist soil. Our plant is not typical and has been 

 named F. vallicola Rydb. 



F. elatior L. Perennial: the stout culm 1-1.5 111. tall, smooth and glab- 

 rous throughout: leaves flat, dark green, 7-15 cm. long, 3-4 mm. wide: panicle 

 narrow, erect, 10-20 cm. long, the branches solitary or in twos: spikelets 

 rather crowded, lanceolate-oblong, 12-18 mm. long, 5-10-flowered: flowering 

 glume scarious margined, acute or obtuse, awnless. 



var. pratensis Gray. Not so tall, .3-1 m. tall, the panicles smaller. 



Both the type and the variety have escaped from cultivation. 



49. BROMUS. 



Inflorescence of terminal panicles, the peduncles thickened at the 

 summit: spikelets few many-flowered: empty glumes unequal, 

 acute: flowering glumes rounded on the back, or sometimes com- 

 pressed-keeled, 5-9-nerved, the apex usually 2 -toothed, generally 

 bearing an awn just below the summit; palet shorter than the 

 flowering glume: grain adherent to the palet. 



Annuals, or sometimes biennials: introduced. 

 Glumes rather broad. 



Awns wanting or very short. B. brizakformis. 



Awns present. 



Panicle contracted. B. hordeaceus. 



Panicle loose. B. secalixvs. 



Glumes narrow. 



Flowering glumes 17-20 mm., its awn 20-30 mm. long : spikelets sol- 

 itary on the branches of the panicle. B. STERH.IS. 

 Flowering glume 11-13 mm., its awn 13-15 mm. long: spikelets sev- 

 eral on each branch of the panicle. B. tectorum. 

 Perennials: native. 



Spikelets narrow, 2-3 cm. long, not compressed. B. vulgaris. 



Spikelets broad, 2.5-4 cm. long, compressed and keeled. 



B. MARGIXATUS. 



B. brizaeformis F. & M. Annual, erect, 30-60 cm. tall: leaf blades pub- 

 escent: panicle 5-25 cm. long, loose, one-sided, nodding: spikelets 15-25 mm. 

 long, elliptical, compressed: flowering glumes very broad, smooth, awnless, 

 or the uppermost with short awns, 1-2 mm. long. Introduced and becoming 

 abundant. 



B. hord6aceus L. Annual, erect, 20-60 cm. tall: leaf blades pilose or 

 smooth, the sheaths pubescent with retrorse hairs: panicle narrow, dense, 

 5-10 cm. long: spikelets erect, 12-15 mm. long, 5-12-flowered: flowering 

 glume pubescent, bearing a stout straight or somewhat twisted awn 6-9 mm. 

 long. 



var, glabrescens Shear. Spikelets smooth or nearly so. 



Both the typical form and the variety are very common. 



B. secalinus L. Annual, erect, 30-70 cm. tall: leaf blades 10-20 cm. long, 

 sparsely hairy above, smooth beneath; sheaths usually glabrous: panicle 

 8-18 cm. long, pyramidal, erect at first, in fruit somewhat drooping: spike- 

 lets oblong-lanceolate, turgid in fruit, 10-1S mm. long: flowering glume 

 glabrous or nearly so, 6-8 mm. long, its margins involute in fruit, tipped 

 with an awn 3-5 mm. long; palet nearly equal to the flowering glume. Com- 

 mon in fields. 



