24 
(1951); Williams (1950); Preble (1902); McClure (1943); Shelford 
and Twomey (1941).) 
Names preceded by an asterisk (*) indicate species not 
listed for Churchill by Ritchie, who (1956) cited 272 species 
from the area, later (1957) adding Festuca rubra, Puccinellia 
paupercula, Carex canescens, C. stans, and Aster puniceus. 
The increase to the present number of 354 has resulted from a 
listing of Churchill specimens in the National Herbarium of 
Canada, particularly those collected during the summer of 1956 
by W, B. Schofield and H. A. Crum, and several noteworthy addi- 
tions by Mrs. Eva Beckett. 
Of the 277 species cited by Ritchie from Churchill, three 
(Salix anglorum, S. desertorum, and S. adenophylla) have been 
dropped from the following lists as being of too uncertain occur- 
rence in the area to warrant inclusion. Urtica gracilis has also 
been dropped, it being undoubtedly introduced. Poa pratensis has 
been excluded, its native representative at Churchill being P. 
alpigena. Other changes are as follows (the names used by 
Ritchie appearing in brackets): Puccinellia pumila (P. pauper- 
cula); Salix planifolia ( S . pellita); Draba luteola (D. minganert- 
sis); Braya novae-angliae var. interior (B, humilis); Potentilla 
pensylvanica var. pectinata (P. pensylvanica); Oxytropis terrae- 
novae (0, johannensis); Kalmia polifolia (K. latifolia); Castilleja 
raupii (C. pallida ssp. elegans); Achillea borealis (A. millefolium 
var. nigrescens). Three of the above (Salix planifolia, Castilleja 
raupii, and Achillea borealis) are listed by Ritchie in addition to 
the species here replaced. Cystopteris dickieana is here treated 
as a variety of C. fragilis, and Salix callicarpaea as a variety of 
S, cordifolia, excluding C. dickieana and S. cordifolia var. tonsa 
from the species list because of the presence at Churchill of the 
typical form or an additional variety. These sixteen deletions, 
together with the addition of the 93 new species denoted by as- 
terisks in the following lists, yield the final figure of 354. 
