121 
Goodyera repens (L.) RJBr. var. ophioides Fernald. Epipactis repens (L.) Crantz 
var. ophioides (Fernald) A. A. Eaton. Peramium ophioides (Fernald) Rydb. 
Rattlesnake Plantain, 
Occasional in rich spruce woods, where it grows in the thick moss 
mat. Flower buds collected during the first and second weeks of 
July, and flowers in late July and early August. 
Pine Lake district, No. 2069; Moose (Eight) Lake district, Nos. 
2066, 2067, 2068; Indian graveyard, Peace river, No. 2071; eastern slope 
of Caribou mountains, No. 2070. 
Lis ter a borealis Morong. Ophrys borealis (Morong) Rydb. Twayblade. 
Occasional in timbered muskegs, where it has been collected in flower 
between June 16 and July 8. 
Fort Smith, No. 460; Pine Lake district, Nos. 2041, 2042; along trail 
about 5 miles north of Indian graveyard, Peace river, No. 2043. 
Calypso bulbosa (L.) Oakes. C. borealis Salisb. Cytherea bulbosa (L.) House. 
Calypso, or Venus' Slipper. 
Occasional in rich spruce forests on the upland, and common in a few 
localities. It flowers early in the season, from the first to the middle of 
June, but late flowers have been found June 26. The plants are in fruit 
about the middle of July. 
Salt mountain, No. 2046; Pine Lake district, No. 2045; eastern edge of 
Caribou Mountain plateau, No. 2047. 
Corallorrkiza trill da Chat. C. Corallorrhiza (L.) Karst. Coral-root. 
Occasional in rich woods and timbered muskegs throughout the area. 
It is very often found growing singly, with no others of its kind anywhere 
near. Collected in flower from the middle to the last of June, and in fruit 
during late July and August. 
East shore of lake Mamawi, No. 2037; Salt mountain, No. 2040 
Pine Lake district, Nos. 2038, 2039; base of eastern slope of Caribou 
mountains, No. 2036. 
SALICACEAE 
Populus tremuloides Michx. White Poplar, Trembling Aspen. 
Abundant in dry, upland woods throughout Wood Buffalo park. Over 
vast areas that have been burned in times past the aspen forms nearly 
pure stands of large, straight trees, often reaching 2 feet in diameter. 
When the growth is young it is close and thicket-like, but in older timber 
there is an open, park-like aspect, in which young spruce and some balsam 
poplar appear. In the young forest the ground cover is exceedingly scanty, 
and there is only a thin mould of dead leaves, but in older timber there is 
an increasing growth of mat-forming mosses and a relatively abundant 
herbaceous flora consisting of grasses and many other plants suitable for 
forage. The aspen is an important source of firewood over much of the 
park area. Fruiting catkins were observed June 13 at Fort Smith, and 
at Pine lake, on June 21, the ripened catkins had nearly all fallen to the 
ground. 
