120 
Near Heart (Raup) lake, No. 2031; Pine Lake district, Nos. 2033, 
2034, 2035; Peace point, No. 2032; sink-hole 16 miles east of Moose lake. 
No. 2029; Moose (Eight) Lake district, No. 2030. 
OECHIDACEAE 
Cypripedium passerinum Richards. See Trans. Roy. Soc., Canada, ser. iii, sec. y T 
pp. 163-172 (1929), for general treatment of this species. Lady's Slipper. 
Occasional in rather dry woodlands. Collected thus far within the 
park only on the shore of Pine lake, where it grows in large patches. 
It was in the height of its flowering period June 25, and well past it July 3. 
Pine Lake district, No. 2044; lower Slave river, No. 469. 
Orchis rotundifolia Pursh. Orchis. 
Common in timbered muskegs throughout the upland districts. Ob- 
served in flow r er between June 16 and July 11. Immature fruits collected 
August 12. 
Fort Smith, No. 475; Pine Lake district, Nos. 2049, 2050; Moose 
(Eight) Lake district, No. 2048; base of eastern slope of Caribou moun- 
tains, No. 2051. 
Habenaria viridis (L.) R.Rr., var. bracteata (Willd.) Grav. Coeloglossum bracteatum 
(Willd.) Pari, 
Occasional in dry upland woods and thickets. Collected in flower 
between June 20 and July 19. Immature fruits observed July 25. 
Pine Lake district, Nos. 2062, 2063; Peace point, Nos. 2064, 2065. 
H. hyperborea (L.) R.Br. Limnorchis hyperborea (L.) Rydfo. L. viridiflora (Cham.) 
Rydb. Boc Orchid, or Rein Orchid. 
Rather common in muskegs throughout. Observed in flower during 
the latter part of June and until July 25. 
Pine Lake district, Nos. 2059, 2061; Observation ridge, about 10 miles 
south of Pine lake, No. 2060; lower Slave river, No. 446. 
H. obtusata (Pursh) Richards. Lysiella obtusaLa (Pursh) Rydb. 
A common species in rich woods and timbered muskegs, and by far 
the commonest orchid in the region. In flower from about mid-June 
through most of July. Immature fruit collected August 11. 
Fort Smith, No. 451; Pine Lake district, Nos. 2054, 2055, 2056; Moose 
(Eight) Lake district, No. 2053; base of eastern slope of Caribou moun- 
tains, Nos. 2052, 2058; eastern edge of Caribou Mountain plateau, No. 
2057; lower Slave river, No. 449. 
Spirantbes Romanzoffiana Cham. Ibidium strictum (Rydb.) House. Ladies' Tresses, 
Occasional in upland timbered muskegs throughout the area. Flower 
buds collected in mid-July and flowers in early August. Immature fruit 
collected August 17. 
Government Hay Camp district, Slave river, No. 2073; near upper 
Smith rapids, No. 465; Observation ridge, about 10 miles south of Pine 
lake, No. 2074; Moose (Eight) Lake district, No. 2072; Little Buffalo 
river, Russell, No. 90. 
