(185 ) 
White Pass (Williams). The species is referred by Gray to 
Aster peregrinus Pursh, and if correctly, this is the older 
name for it. 
Erigeron acris L. Above Fort Selkirk (Tarleton) ; Daw- 
son (Williams). 
Erigeron Yukonensis Rydb. sp. nov. 
Perennial with horizontal rootstock. Stems usually more 
than one, ascending, about 2 dm. high, more or less hirsute : 
basal leaves linear-oblanceolate, 3-10 cm. long, acute or 
acuminate at the apex, below tapering into a short winged 
petiole, more or less hirsute on both sides and ciliate on the 
margin; lower stem leaves linear and short-petioled, the 
upper linear-lanceolate, sessile, 2-3 cm. long: heads 1-3, 
solitary at the end of the stem or the few elongated branches: 
involucre about 15 mm. in diameter, white-hirsute, bracts 
very narrowly linear-subulate, long-attenuate, with the loose 
tips slightly exceeding the disk; rays very numerous, bluish- 
purple, about 12 mm. long and less than 1 mm. wide. 
In general habit, this species resembles most 4. Zatonzz, 
but the size of the head and the numerous narrow rays sug- 
gest £. macranthus and the hairiness of the involucre &. sz- 
plex. The type was collected by R.S. Williams at Dawson, 
July 23, 1899. 
Erigeron multiidus Rydb. Lebarge Island (Tarleton). 
Erigeron caespitosus Nutt. Near Little Salmon River 
(Williams). 
Erigeron grandifiorus Hook. Fort Selkirk (Tarleton). 
Erigeron Turner? Greene. Five-finger Rapids (Tarleton). 
Antennaria pulcherrima (Hook.) Greene. Lower Thirty 
Mile River (Williams). 
Antennaria parvifolia Nutt. Lower Thirty Mile River 
(Williams); Five-finger Rapids (Tarleton). 
Anthemis Cotula L.. Dawson, introduced (Williams). 
Achillea lanulosa Nutt. Dawson (Williams); above Fort 
Selkirk (Tarleton). 
Tanacetum Huronense Nutt. River bank opposite Dawson 
(Williams); Fort Selkirk (Tarleton). Specimens with dark 
brown involucral bracts. 
