169 
Achillea sibirica Ledeb. A. multiflora Hook, See Rhod. xxxi, 219 (1929). 
A common species of delta slough margins and newly formed local 
river flood-plains. Buds and young flowers have been found July 18, and 
the height of the flowering season appears to be late July and early Aug- 
ust. Young shoots appear early in June. 
East shore of lake Mamawi, No. 3368; 30th base line district, Slave 
river, No. 1403: Murdock Creek district, No. 3371; Government Hay 
Camp district, Slave river, No. 3370; Peace point, No. 3372; base of east- 
ern slope of Caribou mountains, No. 3369. 
A. Millefolium L. Common Yabrow, White-top. 
Although the writer’s material shows considerable variation, he has 
been unable to make a definite separation of it into more than one species. 
It includes forms that show many gradations between A. Millefolium and 
A.'lanulosa Nutt., in the characters commonly used to separate these two. 
Consequently, until further critical study has been made it is thought 
best to determine it as above. 
A common species of prairies, damp meadows, and clearings through- 
out the area. Flower buds appear about mid-June, and the first flowers 
about July 1. Flowering continues through the middle part of August. 
East shore of lake Mamawi, No. 3345; Government Hay Camp dis- 
trict, Slave river, Nos. 3353, 3357, 3358; near Heart (Raup) lake, Nos. 
3352, 3354; Fort Smith, Nos. 1398, 1399 {Mrs. Conibear coll.) ; near Mis- 
sion Farm, No. 3360; Pine Lake district, No. 3359; Peace point, Nos. 
3355, 3356; sink -hole 16 miles east of Moose lake, No. 3362; Moose 
(Eight) Lake district, Nos. 3361, 3363, 3364, 3365, 3366, 3367; Indian grave- 
yard, Peace river. No. 3346; base of eastern slope of Caribou mountains, 
Nos. 3347, 3348, 3349, 3350, 3351 ; junction of Little Buffalo and Nyarling 
rivers, Russell, No. 8; Little Buffalo river near the 60th parallel, Russell , 
No. 85. 
Chrysanthemum Leucanthemum L., var. pinna lifidum Leeoq and Lamotte. Ox-eye 
Daisy. 
Collected thus far only in an upland cabin clearing, where it is prob- 
ably adventive. In flower July 6. 
Pine Lake ranger station, No. 3344. 
Artemisia canadensis Miehx. Canada Wormwood. 
Occasional in dry prairies and on sandy banks. Flower buds collected 
early in July, and flowers in the latter part of August. 
Near Heart (Raup) lake, No. 3338; Fort Smith, No. 1388 {Mrs. 
Conibear coll.); Pine Lake district, No. 3340; sink-hole 16 miles east of 
Moose lake, No. 3339. 
A. dracunculoides Pursh. Wormwood. 
Common in the drier parts of the semi-open prairies. Young flowers 
found in the latter part of July. 
Peace point, Nos. 3333, 3334; base of eastern slope of Caribou moun- 
tains, No. 3332. 
