(154) 
longer callus-hairs and the deep purple color of the panicle 
readily distinguish it. 
Calamagrostis Canadensts acuminata Vasey. Dawson, 
July 14, 1899; Klondike City, July 23, 1899; Bennett City, 
August 25, 1899 (Williams). 
Calamagrostis Lapponica (Wahl.) Hartm. Dawson, July 
13, 1899 (Williams). This exactly matches a specimen in the 
herbarium of Columbia University from Wahlenberg, labeled 
Arundo Lapponica. It has long been uncertain whether we 
had this species in this country, but this collection definitely 
settles the point, if the specimen from Wahlenberg, above 
referred to, is typical of his species, the original description, 
however, calling for a taller plant. The grass secured by 
Mr. Williams is a tufted perennial with culms erect and 3-4 
dm. tall, the innovations being about one-third as long as the 
culm with their leaf-blades very narrow and often involute: 
panicle contracted, 7-9 cm. long and 1 cm. or a little more 
wide, its branches erect: spikelets about 5 mm. long, purple 
toward the apex, the flowering scale a little exceeding the 
copious basal hairs and with a rather stout awn inserted at or 
near the middle and about reaching the apex of the scale. 
CALAMAGROSTIS YUKONENSIS Nash, sp. nov. 
A tall slender perennial with a slender running rootstock, 
narrow leaf-blades, and marcescent basal sheaths. Culms 
8-10 dm. tall, erect, the innovations nearly one-half as long 
as the culms: culm-leaves 2; sheaths very rough, much 
shorter than the internodes; ligule scarious, about 5 mm. 
long, decurrent on the sheath; blades gray-green, erect or 
ascending, long-acuminate, very rough on the lower sur- 
face, the upper surface strongly pubescent with short hairs, 
the longer blades on the innovations about 3 dm. long and 
2 mm. wide, those on the culm 1-2 dm. long and 3-4 mm. 
wide: panicle 8-15 cm. long, contracted, its apex sometimes 
nodding, the branches erect, fascicled, strongly hispidulous, 
the longer ones 3-4 cm. long, naked at the base: spikelets 
numerous, on strongly hispid pedicels usually 1-2 mm. long ; 
empty scales hispidulous, strongly so on the prominent keel, 
very acute, yellowish, variegated with purple, the first scale 
5-6 mm. long, 1-nerved, or sometimes with a short lateral 
