48 



cens Del. 1813. 

 counii Vas. p. 



General distribution: This species, which has been introduced from Europe under 

 the name of smooth or Hungarian brome-grass, is being grown in many places 

 throughout the semiarid regions of the West, where it is to be met with as an 

 escape from cultivation. 



It is very closely related to Bromus pumpellianus, but has narrower panicles and 

 spikelets, also smoother glumes. 



28. BROMUS PUMPELLIANUS Scribn. Bui. Torr. Bot. Club 15 : 9. Jan. 1888. 

 Bromus purgatis purpurascens Hook. Fl. Bor. Am. 2 : 252. 1840. Not B. purpuras- 



Bromu!^ mn- 

 p. Bui. Torr. 

 Bot. Club, 15: 48. 1888. 

 ( Fig. 29. ) 



stout, erect perennial, 6-12 

 dm. high, with creeping root- 

 stocks. Culms smooth or 

 pubescent at the nodes. 

 .Sheaths smooth or sparsely 

 pilose-pubescent; ligule firm, 

 truncate, rarely exceeding 1 

 mm. long; blades broadly 

 linear-lanceolate, 5-10 mm. 

 wide, 1-2 mm. long, mostly 

 smooth below and scabrous 

 or somewhat pubescent 

 above, somewhat auriculate 

 at base, point frequently in- 

 volute and rigid when dry. 

 Panicle rather narrow, erect, 

 10-20 cm. long, mostly 10-15 

 cm.; branches short, erect, 

 or ascending. Spikelets 

 mostly . 7-11-flowered, 2-3 

 cm. long, terete-acuminate 

 at first, somewhat laterally 

 compressed at and after flow- 

 ering, 5-7 mm. wide; empty 

 glumes smooth and shining, 

 the lower 1-nerved, or rarely 

 with two faint lateral nerves, 

 acuminate, 6-8 mm. long, the 

 upper broader, 7-10 mm. 

 long, 3-nerved; flowering 

 glume broad, ovoid-lanceo- 

 late, subacute, 5-7-nerved, 

 10-12 mm. long, deiinely <tnd 

 coarsely dHate-pubescent on the margin, nearly or quite to the apex and across the back 

 ill tlir Ixixc; ape.x slightly emarginate; awn mostly 2-3 nun. long, rarely reaching 

 4-5 nun. long, or occasionally nearly or quite muticous; palea nearly equaling its 

 glume; rachilla slender, pilose-pubescent. 

 Type No. 418, collected by F. Lamson-Scribner in the Belt Mountains, Montana. 

 General distril)ution: Colorado to South Dakota north to western Alaska. 

 Specimkns examined. — Colorado: Dillon (C. L. Shear IO682); Penns Gulch (G. W. 

 Letterman 93); El Paso County (G. W. Letterman 38); Pikes Peak (C.L. Shear 

 771); Villa Grove (C. L. Shear 885); Breckenridge (C. L. Shear 1082); Veta Pass 



Fig. 2><.— Bromus inermis: a, a spikelet; c, ventral view of a 

 florrt. showing the palea and a joint of the rachilla. 



