LAMSON-SCRIBNER AND MERRILL— GRASSES OF ALASKA. 87 



Agropyron violacescens Beal, Grasses N. Amer. 2: 635. 1896. 



A rather stout, smooth perennial, 60 to 80 cm. high, with rough, involute-pointed 

 loaves and erect, usually one-sided, hoarded spikes 7 to 10 cm. long; glumes exceed- 

 ing the florets, 12 to 16 mm. long; lemmas 10 to 13 mm. long, with a scabrous awn 

 about 2.5 cm. in length. 



The Upper Yukon, and southward to Colorado, Nebraska, and Minnesota. 



Specimen examined: Dawson, Williams in 1899. 



8. Agropyron spicatum (Pursh) Rydb. Mem. N. Y. Bot. Gard. 1: 61. 1900. 



Festuca spicata Pursh, Fl. Amer. Sept. 1: 83. 1814. 



Agropyron divergens Nees in Steud. Syn. PI. Glum. 1: 347. 1854. 



A rigid wiry, cespitose, glabrous perennial, 30 to 90 cm. high, with narrow, flat or 

 involute leaves and erect spikes; glumes acute, about one-half as long as the spikelet; 

 lemmas terminating in a stout, scabrous divergent awn 1 to 2.5 cm. long. 



Dry rocky soils and bench lands, Washington and Montana to Colorado; reported 

 from Alaska. 



We have seen no specimens of this grass from Alaska. It is, however, reported 

 from there by F. Kurtz « from dry hills, Kloquan (444a). 



8a. Agropyron spicatum tenuispicum (Scribn. & Smith) Rydb. Mem. N. Y. Bot. 

 Gard. 1: 6L. 1900. 

 Agropyron divergens tenuispicum Scribn. & Smith, U. S. Dept. Agr. Div. Agrost. 

 Bull. 4: 27. 1897. 

 A slender form with flexuous spikes 8 to 15 cm. long, smaller spikelets, and shorter 

 awns than in the species. 

 Range of the species. 



We have seen no specimens of this grass from Alaska. It is, however, reported & as 

 collected at Dawson by R. S. Williams in 1899. 



Aqeopyron kepens (L.) Beauv. is reported from Kotzebue Sound (Turner 1886) 

 and from Eschscholtz Bay,c but it is certain that this species does not extend to 

 Alaska, the plants so referred being doubtless forms of Agropyron violaceum (Hornem). 

 Lange. 



26. HOEDETJM L. 



Hordeum L. Sp. PI. 84. 1753. 



Spikelets 1-flowered, 2 or 3 at each joint of the articulate rachis, sessile or on very 

 short pedicels; rachilla articulated above the glumes and continued behind the palea 

 of the central spikelet into a naked bristle; glumes 2, subulate, setaceous, rigid; 

 lemmas lanceolate, rounded on the back, usually awned. Annual or perennial grasses 

 with terminal cylindrical spikes and awned spikelets. 



Glumes 4 to 7 cm. long _ 1. H. jubatum. 



Glumes 2 cm. long or less. 



Leaf blades 4 to 8 mm. wide; spike rather stout, lateral spikelets 



strongly developed 2. 77. boreale. 



Leaf blades 3 mm. wide or less; spike slender, lateral spikelets 



but slightly developed 3. H, nodosum. 



1. Hordeum jubatum L. Sp. PI. 85. 1753. Squirrel-tail grass. 



A smooth, slender, cespitose, erect perennial, 20 to 60 cm. high, with flat leaves and 

 long-bearded, nodding spikes, 5 to 10 cm. long, the awns 4 to 7 cm. in length. 



In moist, usually saline soil, in the upper Yukon, east to Newfoundland, south to 

 Colorado and California. 



"Bot. Jahrb. Engler 19: 424. 1894. 



b Nash, Bull. N. Y. Bot. Gard. 2: 158. 1901. 



c Ledeb. Fl. Ross. 4: 340. 1854. 



