( i85 ) 



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. now 



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 E. Eaton ii, 

 but the size of the head and the numerous narrow rays sug- 

 gest E. macrantkus and the hairiness of the involucre E. sim- 

 plex. The type was collected by R. S. Williams at Dawson, 

 July 23, 1899. 



Erigeron multifidus Rydb. Lebarge Island (Tarleton). 



Erigeron caespitosus Nutt. Near Little Salmon River 

 (Williams). 



Erigeron grandiftortis Hook. Fort Selkirk (Tarleton). 



Erigeron Turneri 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 lannlosa Nutt. Dawson (Williams) ; above Fort 

 Selkirk (Tarleton). 



Tanacetum Iluronense Nutt. River bank opposite Dawson 

 (Williams); Fort Selkirk (Tarleton). Specimens with dark 

 brown involucral bracts. 



