123 
ets. Found in fruit on the Salt Plains A-ugust 19, and in the mountains 
July 11. 
Near Heart (Raup) lake, No. 2139; eastern edge of Caribou Moun- 
tain plateau, No. 2140. 
S. MacCalliana Rowlee. 
Common in thickets on the Salt Plain, and occasional on marshy lake 
margins elsewhere on the upland. Immature fruit collected June 15, and 
mature fruit during the middle part of August. 
Near Heart (Raup) lake, No. 2165; near Mission Farm, No. 2166; 
Moose (Eight) lake, No. 2164. 
S. glauca L. See Rhod. xxxiii, 241-4 (1931). 
Common throughout the upland districts, where it inhabits muskeg 
thickets and open muskeg timber, or the borders of rich w T oods. It varies 
widely in leaf-form and pubescence, and in the form and size of the shrub, 
but is not sufficiently variable to make from it more than a single specific 
entity. Flowering specimens of both sexes have been collected June 20, 
When they appeared to be at the height of their season. Male flowers 
persist through the first half of July. Fruits begin to mature in late June 
and early July, and may be collected in good condition during the third week 
in August. 
Government Hay Camp district, Slave river, No. 2129; near Heart 
(Raup) lake, No. 2128; Pine Lake district, Nos. 2132, 2133, 2136, 2137, 
2138; Moose (Eight) Lake district, Nos. 2130, 2131, 2134, 2135; base of 
eastern slope of Caribou mountains, No. 2126; eastern edge of Caribou 
Mountain plateau. No. 2127. 
S. Iutea Nutt. Yellow Willow. 
Abundant on the upper parts of local river flood-plain deposits, where it 
makes a transition stage between the sand-bar willows and the encroaching 
poplar timber. Its foliage has a bluish green cast which sets it off as a 
distinct band of vegetation on these areas. Flowers collected during the 
first week in June, and fruit during the latter half of June and early July. 
Along Quatre Fourches river, Nos. 555, 558; 30th base line, Slave river, 
No. 554; Peace point, No. 2102; lower Slave river, No. 557. 
S. Farrae Rail. See Cont. UR. Nat. Herb, xxii, 321' (192il) ; Jour. Am, Arboret. iii, 72 
(492,1) ; Univ. Calif. Pub. in Rot. xvii, 406-9 (1934). 
Apparently rare in the region, and collected thus far only from a 
muskeg thicket in Caribou mountains. It had immature fruit July 11. 
Eastern edge of Caribou Mountain plateau, No. 2085. 
S. myrtillifolia Anders. 
An abundant willow in muskeg thickets and muskeg timber throughout 
the region. In such situations it is either a lotv bush or a dwarfed, trailing 
shrub growing in the moss mat, but in semi-open prairies, where it is 
occasionally found, it sometimes grows to a height of 10 feet. Leaf char- 
acters are also extremely variable. Flowers appear during the second and 
third weeks of June, and fruits during the latter part of June and the first 
