59 



short-pUose above, smooth beneath. Panicle large, lax, drooping, 2.5-3.5 dm. long; 

 lower branclie.'^ 2-4, long, weak, spreading, usuallg bearing 1-3 spikeleti^ on long, slender 

 pedicels. Spikelets 2.5-3 cm. long, 6-8 mm. wide, oblong-lanceolate, strongly lat- 

 erally compressed, rather loosely flowered ; empty glumes acute, smooth or scab- 

 rous on the nerves, the lower lanceolate, 3-nerved, 8-9 mm. long, the upper 

 broader, 5-7 nerved, 10-12 mm. long; flowering glume broadly lanceolate, acute, 

 about 12-14 mm. long, 7-nerved, smooth or scabrous, shortly bidentate at the 

 apex, with a straight aim 6-9 mm. long ; palea considerably shorter than its glume, 

 short pectinate-ciliate on the keels. 



Type from the Island of Sitka. 



General distribution: Alaska 

 south to Washington, appar- 

 ently near the coast. 



Specimens examined. — A laska: 

 Unalaska (Dr. A. Kellogg 

 142); Hope Island (Dr. A. 

 Kellogg 143); YesBay(Thos. 

 Howell 1722A)— a form ap- 

 proaching B. aleutensis in its 

 shorter awn and somewhat 

 broader flowering glume. 

 Cascade Mountains : 49 n. lat. 

 (Dr. Lyall in 1859)— a form 

 approaching B. c a r i n at u s 

 hookerianus. 



This species is related to B. aleu- 

 tensis and B. carinaius hook- 

 erianus, but most closely to 

 the latter, from which it dif- 

 fers in the typical form in its 

 more robust form, laxer pani- 

 cle with fewer spikelets and 

 much longer, weaker, si)read- 

 ing branches. 



35. BROMUS CARINATUS 

 Hook. &; Arn. Bot. Beech. 

 Voy. Suppl. 403. 1841. Bro- 

 ■mus hookerianus minor Scril)n. 

 in Beal, Grass. N. A. 2 : 614. 

 1896. Bromus Oregon us Nutt. 

 in Herb. Acad. Nat. Sci. Phil. 

 (Fig. 37.) 



An annual or biennial with erect 

 (ulin, linear leaves, and erect 

 or suberect panicle. Culm about 5-8 dm. high, slightly pubescent at the nodes. 

 Sheaths mostly shorter than the nodes, retrorsely soft pilose; ligule 3-4 mm. long, 

 sublaciniate; blades flat, mostly narrow, about 1-2.5 dm. long, 3-6 mm. broad, tliinly 

 pilose both sides. Panicle pyramidal, somewhat lax, about 1.5-2.5 dm. long; lower 

 branches about 3, spreading, or somewhat drooping. Spikelets lanceolate to 

 suboblong-lanceolate, compressed, about 2.5-3 cm. long and 5 mm. broad, 5-9 flow- 

 ered; empty glumes Zanceofate, acide, glabrous to slightly scabrous-pubescent; the lower 

 distinctly 3 or sometimes obscurely 5 nerved, 7-9 mm. long; the upper 5 or some- 

 times obscurely 7 nerved, 9-11 nmi. long; flowering glume lanceolate, obscurely 



Fig. 37. — Bromus carinatuii: a, empty glumes with three 

 florets; b, dorsal view of a flowering glume. 



