(155) 
nerve on each side near the base, broader than and a little 
exceeding the 3-nerved second; flowering scale strongly his- 
pidulous, 4-5 mm. long, 5-nerved, the nerves usually excur- 
rent in short awns, the dorsal awn inserted about one-quarter 
way from the base of the scale, its column yellowish brown, 
closely spiral and about reaching the apex of the scale where 
it is strongly bent, the divergent portion much exserted and 
5-6 mm. long; palet a little shorter than the scale, irregu- 
larly and finely toothed at the apex, 2-nerved, the nerves 
sometimes barely excurrent; callus with a tuft of hairs on 
each side about 0.5 mm. long, the dorsal portion naked: 
rudiment 4 to } as long as the scale, pubescent with erect 
hairs 1 mm. or a little less long, sometimes bearing an awn. 
Type collected by R. S. Williams in dry soil in open 
places at Dawson. There is also a specimen in the herba- 
rium of Columbia University collected by Kennicott on the 
Yukon River, but with no other data. Related to C. Tweedy 
Scribn., but its more slender culms and narrower more open 
panicle, long and narrow leaf-blades with the upper surface 
pubescent, and the smaller spikelets readily separate it. 
Calamagrostis purpurascens R. Br.? An unusual loose- 
panicled form with large anthers, fully 3 mm. long. It may 
be undescribed. Five-finger Rapids (Tarleton). 
Deschampsia atropurpurea (Wahl.) Scheele. White Pass, 
August 26, 1899 (Williams). The branches of the panicle 
are exceedingly long, much longer than in the typical form, 
the lower ones being 10-12 cm. long, spikelet-bearing only 
at the summit, and drooping. The spikelets, however, are 
identical with those of the common form. 
Deschampsia caespitosa (Li.) Beauv. Dawson (Williams). 
Deschampsia calycina Pres]. Dawson (Williams). Re- 
garded by the collector as introduced. 
TRIsETUM ALASKANUM Nash, sp. nov. 
A tufted pubescent perennial with the innovations about 
one-half as long as the culms. Culms 2-4 dm. tall, stout, 
ascending, densely villous with reflexed hairs: leaves 2; 
sheaths loose, pubescent with soft reflexed hairs; ligule 
scarious, about I mm. long; blades lax, pubescent with soft 
spreading hairs, those on the culm 8-10 cm. long, 3-4 mm. 
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