(i50 



Aloftecurus geniculates L. Ft. Selkirk (Tarleton). 

 Alopecurus alpinus J . E. Smith. Ft. Selkirk (Tarleton). 

 Arctagrostis angustifolia Nash, sp. nov. 



A rather leafy perennial, with long running rootstocks. 

 Culms erect, rather slender, 10-12 dm. tall, bracted at the 

 base, the bracts gradually passing into leaves : leaves 3 or 

 4 ; sheaths, at least all but the lowermost, shorter than the 

 internodes, roughened at the summit ; ligule scarious, 5-6 

 mm. long, decurrent on the sheath; blades apparently lax, 

 rough on both surfaces, 2-3 dm. long, 3-5 mm. wide, long- 

 acuminate : panicle rather slender, contracted, nodding at 

 the apex, 2-2.5 dm. long, its axis smooth, the fasciculate, 

 somewhat hispidulous, branches appressed, the larger ones 

 4-6 cm. long and naked at the base : spikelets numerous, 

 about 3 mm. long, on hispidulous pedicels usually about 0.5 

 mm. long ; empty scales acute, i-nerved, or the second some- 

 times with an additional lateral nerve on each side of the 

 base, the first scale about two-thirds as long as the second 

 which is usually a trifle shorter than the palet ; flowering 

 scale acute, about 3 mm. long, strongly hispidulous, usually 

 i-nerved, or rarely with a very obscure lateral nerve on each 

 side, in side view lanceolate and about 0.5 mm. wide; palet 

 slightly shorter than the scale or equalling it, faintly 2-nerved, 

 strongly hispidulous ; stamens 3, about 1.5 mm. long. 



Type collected by R. S. Williams on damp mountain side 

 among brush at Dawson, on August 14, 1899 ; also secured 

 near Big Salmon, on August 22. Resembling A. fioaeoides 

 described below, and A. arundinacea (Trin.) Beal in the 

 basal bracts, from both of which, however, it is clearly dis- 

 tinct in its taller and more slender culms and slender panicle, 

 and the narrow flowering scales, which characters, together 

 with its long lax leaves, at once separate it from A. poacoidcs. 

 Arctagrostis macrophylla Nash, sp. nov. 



A rather leafy perennial, with a running rootstock. Culms 

 rather stout, 4-8 dm. tall, erect; leaves usually 3 or 4; 

 sheaths rather loosely embracing the culm, the lower ones 

 overlapping and exceedingly rough ; ligule scarious, 4-5 

 mm. long, decurrent on the sheath ; blades erect, very rough 

 on both surfaces, 2-4 dm. long, 8-12 mm. wide, long-acu- 

 minate : panicle contracted, 1.5-2 dm. long, its axis and erect 

 branches rough, the fasciculate branches of varying length, 



