(i56.) 



wide, those on the innovations narrower and longer : panicle 

 contracted, strict, 4-5 cm. long, 1-1.5 cm. thick, its axis and 

 appressed branches pubescent with long hairs, the branches 

 spikelet-bearing to the base, the larger ones 1— 1.5 cm. long : 

 spikelets 6-7 mm. long, crowded, 2-3-flowered ; empty scales 

 brownish or yellowish brown, strongly hispidulous on the 

 keel, sparingly so on the surface, the midnerve excurrent in 

 a short point, the first scale i-nerved, the second 3-nerved ; 

 flowering scales strongly hispidulous, not exserted, the callus 

 pubescent with hairs about 0.25 mm. long, acute, shortly 2- 

 toothed at the apex, the teeth awn-pointed, the awn inserted 

 about one-third way down, stout, hispidulous, finally strongly 

 reflexed, about the length of the scale ; palet about four-fifths 

 as long as the scale, 2-toothed at the apex. 



On steep open hillsides, Skagway, August 28, 1899 

 (Williams). Related to T. subspicatum (L.) Beauv., but the 

 larger spikelets with their included flowering scales at once 

 distinguish it from any form of that species. 



Trisetum subspicatum (L.) Beauv. Dawson (Williams). 



Trisetum subspicatum molle (Michx.) A. Gray. Summit 

 of White Pass (Williams) ; Ft. Selkirk (Tarleton). 



Trisetum sp. Five-finger Rapids, Aug. 21, 1899 (Wil- 

 liams). This is probably undescribed, but the parts of the 

 spikelets are so abnormally large, owing to its infestation by 

 nematode worms, that its description as new is not war- 

 ranted. 



Avena sativa L. Dawson. Introduced (Williams). 



Poa arctica R. Br. Klondike Bottom (Williams). 



Poa nemoralis L. Dawson (Williams). 



Poa nemoralis L. ? Dawson (Williams). 



Poa nemoralis L. ? Five-finger Rapids (Tarleton). 



Poa pratensis L. Rink Rapids (Williams). 



Poa Williamsii Nash, sp. nov. 



A tufted smooth and glabrous perennial, the innovations 

 apparently intravaginal and much shorter than the culm. 

 Culms 1.5-2 dm. tall, erect or ascending: leaves 1 or 2 ; 

 sheaths striate; ligule scarious, about 2.5 mm. long; blades 

 erect, about 2 mm. wide, acuminate, those on the culm 2-4 

 cm. long, those on the innovations sometimes longer : panicle 



