(159) 
Carex saxatilis L. Thirty-mile River (Williams). 
Carex Graham? Boott. Near Stewart River (Williams). 
Carex alpina Sw. Dawson (Williams); White Horse 
Rapids (Tarleton). 
Carex Gmelint Hook. Skagway (Williams). 
Carex stylosa Drejer. Mouth of Bonanza; also a speci- 
men doubtfully referred to this species from Dawson Swamp 
(Williams). 
Carex Yukonensis Britton sp. nov. 
Group of C. caespfitosa. Culms slender, roughish, 2.5-4 
dm. high, longer than the leaves. Leaves narrowly linear, 
roughish margined, 2 mm. wide, the midvein prominent; 
lowest spike subtended by a nearly filiform bract 1-2.5 cm. 
long; staminate spike terminal, stalked, 2-2.5 cm. long; 
pistillate spikes 2 or 3, 1.5-2 cm. long, 2.5 mm. thick, dense, 
apparently erect, the upper nearly sessile, the lower one, 
when 3 are present, filiform-stalked, loosely lowered toward 
the base; perigynia nearly orbicular, nerveless, I mm. in 
diameter, very minutely beaked, lenticular, sharply margined, 
about as long as the black, ovate-oblong, acute or acutish 
scale; stigmas 2 or 3. 
Mouth of Bonanza Creek, R. S. Willliams, June 18, 1899. 
Carex rigida Good?. Mouth of Bonanza Creek (Williams). 
Carex acuiina Bailey. Mouth of Klondike (Williams). 
Carex podocarpa R. Br. White Pass (Williams). 
Carex Magellanica Lam. Klondike River Bottom; near 
Mouth of Klondike (Williams). 
Carex capillaris L. Dawson (Williams). 
Carex altocaulis (Dewey) Britton. Hillside among willows, 
Dawson and at Walker Gulch (Williams). 
Carex bicolor All. Ten miles above Lebarge (Williams). 
Carex concinna R. Br. Dawson (Williams); Lake Ben- 
nett (Tarleton). 
Carex filifolia Nutt. Miles Cafion (Williams). 
Carex Williamsii Britton, sp.-nov. 
Glabrous ; culms filiform, smooth, 1-2.5 dm. high. Leaves 
filiform-linear, shorter than the culms, equitant, 1 mm. wide 
