150 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Specimens examined: Olympic Mountains, Flett 830; Fairhaven, Pifer 2603; Seattle, 

 Smith 803; Tacoma, Fleit 45, Leckenhy; Columbia River, 46° to 49°, Lyall in 1860; Step- 

 toe, Vasey 16; without loeality, Sandberg cfc Leiberg 245; Box Canyon, Pend Oreille River, 

 Kreager 433. 



Zonal distribution: Transition. 



5a. Hordeum nodosum depressum Scrii)n. & Smith, U. S. Dept. Agr. Div. Agrost. 

 Bull, 4: 24. 1897. 

 Type locality: Near Lexington, Morrow County, Oregon. Collected by Leiberg. 

 Range: Washington to California. 

 Specimens examined: Klickitat County, (S'j/AWo// in 1886: Wash tucn a, 6'o/to;i 990. 



6. Hordeum boreale Scribn. & Smith, U. S. Dept. Agr. Div. Agrost. Bull. 4: 24. 1897. 

 Type locality: "Aleutian Islands and Alaska to Oregon and California." 



Range: Ala.ska to California. 



Specimens examined: Pullman, Piper 1747; Steptoe, Vasey, July 2, 1901; Kittitas 

 County, Vasey 49; west Klickitat County, Sul'sdorf 1168. 

 Zonal distribution: Transition. 



7. Hordeum geniculatum All. Fl. Ped. 2: 259. 1785. 



Hordeum maritimum With. Bot. Air. Brit. Veg. cd. 3. 2: 172. 1796. 

 Type locality': Piedmont, Italy. 



Specimens examined: ^Seattle, Smith 814; Dry Creek, Whitman County, Vasey 52; 

 Waitsburg, Horner 247; Walla Walla, Leckenby, May 19, 1898, Grijfith cO Cotton, 556. 



ELYMUS. Ryegrass. 



Annual ; glumes rigid, spreading 1 . E. caput-medusae 



Perennials. 



Tufted grasses without rootstocks. 

 Culms stout, 1 to 2 meters high. 



Spikelets 1 to 1.5cm. long, usually glabrous or scabrous. 9. E. condensatus. 



Spikelets 2 to 3 cm. long, pubescent 10. E. arenarius. 



Culms slender, seldom 1 meter high. 



Lemma pubescent; spike nodding 2. E. canadensis. 



Lemma not pubescent; spike erect. 

 Glumes subulate. 



Awns of lemma 30 to 40 mm. long 3. Z?. hcTcenbyi. 



Awns of lemma 3 to 5 mm. long A. E. aristatus. 



Glumes lanceolate. 



Awns of lemma well developed. 



Spikes dense; lemma not ciliate 5. E. glaucus. 



Spikes usuallyinterrupted; lemma ciliate. 6. FL borealis. 

 Awns of lemma short or obsolete. 



Glumes rigid, longer than the spikelet. . 7. E. virginic}is. 

 Glumes not rigid, shorter than the spike- 

 let 8. E. virescens. 



Not tufted but spreading by long rootstocks. 



Lemmas long-villous 11. E. Jlavescens. 



Lemmas not long-villous. 



Spike dense; lemma scal)rous-puberulent; glumes 



sparsely hirsute 12. E. vancouverensis. 



Spike not dense; glumes not hirsute. 



Lemma glabrous, usually glaucous 13. £'. triticoides. 



Lemma puberulent 14. E. arenicola. 



