( 186 ) 
Artemisia laciniata Willd. Sp. Pl. 3: 1843. Above 
Fort Selkirk (Tarleton, no. 111). 
This specimen agrees with Karelin and Kiriloff’s no. 
705, determined as A. laciniata glabriuscula Ledeb., from 
Narym, Siberia. This is cited by Ledebour, Fl. Ross. 2: 
582, as variety a of the species. It also answers to the de- 
scription of the species, and to the left hand figure of Gmelin’s 
Fl. Sib. 2: Al. 57, except that the heads are a little larger. 
The species has not hitherto been reported from America; 
it is said in Kew Index to occur also in the Himalayas. 
Artemisia elatior (T. & G.) Rydb. Fifty miles below 
Stewart River (Tarleton); Dawson (Williams). 
Artemisia Canadensis Michx. Selkirk (Williams). 
Artemisia frigida Willd. Dawson (Tarleton); near 
Little Salmon River (Williams). 
Artemista longipedunculata Rudolph. White Pass 
(Williams). 
Petasites frigida (L.) Fries? Lake Bennett (Tarleton). 
Dawson Swamp (Williams). Mr. Tarleton’s specimens 
differ from the typical European plant in having much more 
deeply lobed leaves. 
Petasites gracilis Britton, sp. nov. 
Scape slender, about 4 dm. high, sparingly lanate. Leaves 
thin, broadly ovate, subcordate, loosely lanate beneath, 5-6 
cm. broad, with about twelve large acute cuspidate teeth or 
short lobes, the sinuses rounded; petiole slender, twice as 
long as the blade; scales of the scape and bracts of the in- 
florescence lanceolate, acuminate: inflorescence racemose, 
about 1 dm. long: peduncles very slender, glandular-pubes- 
cent, 2-5 cm. long: involucre glandular-pubescent, its linear- 
oblong obtuse bracts about half the length of the bright white 
pappus, the few outer bracts much shorter. 
Walker Gulch, Williams, July 16, 1899. 
Arnica angustifolia Vahl. Dawson (Williams); Lebarge 
Island (Tarleton). Differing from typical specimens of this 
species by having three long-peduncled flower-heads. 
Senecio frigidus Less. Dawson (Williams). 
