LAMSON-SCRIBNER AND MERRILL GRASSES OF ALASKA. 83 



lemmas 12 to 15 mm. long, appressed-pubeseent from the second nerve to the margin 

 and also across the base. 



In damp soil and on shaded slopes, arctic Alaska to the Shumagin Islands and Cook 

 Inlet, thence to Wyoming and Arizona. 



Specimens examined: Shumagin Islands, Popof, Kincaid in 1899; Kenai, Piper 

 4685; Chandlar (Gens de Large) River, Schrader in 1899; opposite Port Axel (Kachemak 

 Bay?), Piper 4682. 



4. Bromus pacificus Shear, U. S. Dept. Agr. Div. Agrost. Bull. 23: 38./. 21. 1900. 

 A stout, erect perennial 100 to 150 cm. high, with leafy culms, pubescent nodes, 



retrosely pilose sheaths, and large,* dense, nodding panicles; spikelets 2 to 2.5 cm. 

 long, coarsely pubescent throughout; lemmas 11 to 12 mm. long, the pubescence more 

 dense and somewhat villous towards the base. 



Moist thickets along the coast from Seward Peninsula to southeastern Alaska and 

 southward to Oregon. 



Specimens examined: Prince of Wales Island, Wright 1595; Cape Nome, Blaisdell 

 in 1900 (small form); Sitka, Piper 4684. 



5. Bromus pumpellianus Scribn. Bull. Torrey Club 15: 9. 1888. 



A stout, erect perennial 60 to 120 cm. high, with creeping rootstocks, smooth or 

 pubescent nodes and sheaths, and narrow, erect, panicles 10 to 20 cm. long; spikelets 

 2 to 3 cm. long; lemmas densely and coarsely pubescent along the margins and 

 across the back at the base. 



In moist, usually shaded soils, upper Yukon to North Dakota and Colorado. 



Specimens examined: Fort Yukon, Bales in 1889, Georgeson 17; Yukon River, 

 Dawson 92 in part; Steamboat Slough (upper Yukon Valley), Gorman 1090; Fort 

 Selkirk,. Tarleton 135; Circle City, Osgood in 1899; Dawson, Williams in 1899. 

 5a. Bromus pumpellianus tweedyi Scribn. in Beal, Grasses N. Amer. 2: 622. 1896. 



A form differing from the species in its usually pilose-pubescent sheaths and leaves 

 and lemmas with coarser, denser, and more hirsute pubescence. 



Occurs with the species. 



Specimen examined: Yukon River, Dawson 92 in part. 



li. Bromus arcticus Shear, sp. nov. 



A rather stout, erect perennial 50 to 80 cm. high, from creeping rootstocks, with 

 smooth or sparsely pilose-pubescent sheaths, broadly linear-lanceolate leaves, and 

 rather narrow, erect, purplish panicles 10 to 20 cm. long; culms slightly pubescent at 

 the nodes; ligule membranous, laciniate-dentate, 1 to 2 mm. long; leaf blades sca- 

 brous, usually more or less pilose-pubescent on the nerves, 15 to 25 cm. long, 5 to 8 

 mm. wide; panicles purplish, the lower branches 1 to 3 at each node, 3 to 10 cm. long, 

 spreading in flower, erect or ascending at maturity; spikelets 6 to 10-flowered, 2 to 4 

 cm. long, 5 to 7 mm. wide, laterally compressed in flower; glumes coarsely pubescent, 

 the first 1-nerved or sometimes with two faint lateral nerves, sharply acuminate, 8 to 

 9 mm. long, the second broader, 3-nerved, 11 to 12 mm. long; lemmas ovate-lanceolate, 

 subacute, 5-nerved, 12 to 14 mm. long, rather densely and coarsely pubescent over the 

 whole' exterior, awned from the emarginate apex; awns about 2 mm. long; palea 

 shorter than the lemma, about 10 mm. long; rachilla slender, pilose-pubescent. 



Type U. S. National Herbarium no. 379157, collected September 9, 1901, tundra 

 bank, Teller Reindeer Station, Port Clarence, by F. A. Walpole (no. 2066). - 



Specimens examined: Port Clarence, Walpole 2066; without locality, Schrader in ^1^ Q £ 



1901. 



This species is evidently related to Bromus pumpellianus, from which it is distin- 

 guished by its less robust habit of growth, pubescent glumes, and longer and narrower 

 lemmas pubescent throughout. 



