116 
district, No. 1839; Round lake, about 18 miles south of Pine lake, No. 
1837; Peace point, No. 1835; sink-hole 16 miles east of Moose lake, No. 
1836; Moose (Eight) Lake district, Nos. 1831, 1832, 1833; Indian grave- 
yard, Peace river, No. 1829; lower Slave river, Nos. 274, 277; lower Little 
Buffalo river, Russell, No. 22. 
C. retrorsa Sehwein. 
Apparently rare in the park area. Found thus far only along Peace 
river just inside the western boundary, where it inhabits wet slough mar- 
gins. Collected in flower July 31. 
Indian graveyard. Peace river, No, 1961. 
Eleocharis palustris (L.) R. and S. Spike-bush. 
Abundant on marshy shores throughout the park area. It often forms 
nearly pure stands in the shallow water. Young flowers found June 6, 
and flowers throughout July and the first three weeks of August. Fruits 
are matured late in August. 
Cree (Mamawi) creek, No. 1963; lower delta of Athabaska river, 
No. 381; along Quatre Fourches river, No. 380; east shore of lake Mamawi, 
No. 1964; 30th base line district, Slave river, No. 384; Murdock Creek 
district, Nos. 1968, 1969; near Heart (Raup) lake, No. 1966; Fort Smith, 
No. 383; Pine Lake district, No. 1970; Round lake, about 18 miles south of 
Pine lake, No. 1965; sink-hole 16 miles east of Moose lake, No. 1967; 
Moose (Eight) lake, Nos. 1962, 1971. 
E. calva Torr. See Rhod. xxxi, 68 (1929). 
Collected thus far only on the muddy shore of Slave river, where it 
was flowering August 12. 
Government Hay Camp district, No. 1973. 
E. uniglumis (Link) Schultes, See Rhod. xxxi, 71 (1929). 
Apparently rare in the park area, and collected thus far only from the 
margin of a sink-hole pond on the upland. In fruit July 14. 
Round lake, about 18 miles south of Pine lake, No. 1972. 
E. acicularis (L.) R. and S. 
Common on muddy slough margins and shores throughout the area. 
Collected in flower July 11 and during the first three weeks of August. 
Lower delta of Athabaska river, No. 377; Government Hay Camp,. 
Slave river, No. 1974; sink-hole 16 miles east of Moose lake, No. 1975; 
Moose (Eight) lake, No. 1976. 
Eriophorum opacum (Bjornstr.) Fernald. Cotton-grass. 
Common in upland muskegs, where it flowers in the latter part of 
June and fruits in July and August. 
Pine Lake district, Nos. 1984, 1985; Moose (Eight) Lake district. 
Nos. 1986, 1987; base of eastern slope of Caribou mountains, Nos. 1988, 
1989. 
