88 CONTRIBUTIONS FROM TDK NATIONAL HERBARIUM. 



Specimens examined: Ranch Valley (Upper Yukon Valley), Gorman 1079; Fort 

 Yukon, Bates in 1889, Georgeson 23. 



2. Hordeum boreale Scribn. & Smith, U. S. Dept. Agr. Div. Agrost. Bull. 4: 24. 



1897. Northern wild barley. 



A slender, erect perennial with rather broad flat leaves, smooth culms, and erect, 

 terminal spikes 5 to L0 cm. long; leaf blades 4 to 8 mm. wide; glumes setaceous and 

 awn-like, 2 cm. long or less; lateral florets staminate or neuter. Closely related to 

 Hordeum nodosum L. 



Aleutian Islands and Alaska Peninsula to the southeastern boundary, thence south- 

 ward to California; also in the Commander Islands. 



This species is the Hordeum pratense and H. secalinum. of the various published lists 

 of Alaskan grasses. 



3. Hordeum nodosum L. Sp. PI. ed. 2. 126. 1762. Meadow barley. 

 A species closely related to the last, differing in its more slender habit, narrower 



leaves (about 3 mm. wide) more slender spikes, and less developed lateral spikelete. 



Kodiak Island to southeastern Alaska, California, Texas, and Mississippi; also in 

 Europe and Asia. 



Specimens examined: Foggy Hay, near Cape Fox, Gov ilk & Kearney 2565; Kodiak, 

 Piper 4(>5(>. 



27. ELYMUS L. 



Elymus L. Sp. PI. 83. 1753. 



Spikelets 2 to 6-flowered, sessile in pairs at the nodes of the continuous or articulate 

 rachis; rachilla articulated above the glumes and between the florets; glumes 2, 

 subequal, rigid, narrow, I to 3-nerved; the lemmas shorter than the glumes, rounded 

 on the back, obscurely 5-nerved, acute or awned from the apex. Erect grasses with 

 flat leaves and densely flowered terminal spikes. 

 Mostly slender plants; lemmas glabrous or nearly so (filiate on 

 the margins in E. borealis). 



Lemmas awnless or nearly so 1 • E. howelm. 



Lemmas long-awned. 



Lemmas glabrous or scabrous. 2. E. glaucvs rruix- 



imus. 



Lemmas prominently ciliate on the margins 3. E. borealis. 



Mostly stout plants; lemmas villous or pubescent throughout. 



Glumes subulate 4 - E. innovatus. 



Glumes lanceolate. 



Spike less than 8 cm. in length 5. E. villosissimus . 



Spike exceeding 10 cm. in length 6. E. mollis. 



1. Elymus ho wellii sp. nov. 



A rather slender, glabrous perennial 90 to 120 cm. high, with flat, lanceolate leaves, 

 exserted spikes, and awnless spikelets; culms geniculate below, the nodes, at least the 

 upper ones, appressed-pubescenl ; sheaths shorter than the internodes; ligule hyaline, 

 truncate, about 2 mm. long; leaf blades 15 to 25 cm. long, 8 to 12 mm. wide, acuminate, 

 scabrous above, glabrous beneath; spike 8 to 10 cm. long, 1 cm. or less in diameter, 

 densely flowered, the rachis prominently scabrous on the margins; spikelets in pairs, 

 about 1.5 cm. long; glumes subequal, lanceolate, acuminate, equaling thespikelet, 1 

 to 2 mm. wide, strongly nerved, scabrous; first lemma 12 to 14 mm. long, lanceolate, 

 acuminate, and sometimes bearing an awn 1 mm. long, glabrous or slightly scabrous 

 above, ciliate-scabrous on the margins; palea somewhat shorter than the lemma, 

 ciliate-scabrous on the nerves. 



Type U. S. National Herbarium no. 592340, collected August 14, 1895, Revillagigedo 

 Island by Thomas Howell (no. 1723) and distributed as " Elymus dahuricus Turcz.(?) ; ' 



