360 B. N. A. BOUNDARY COMMISSION. 

Symphoricarpus occidentalis, R.Br. Lake of the Woods. Red River, June 
27,73, in flower. 
LOASACEA. 
Mentzelia ornata, Pursh. and Nutt. Foot-hills of West Butte (sheltered valley), 
July 31, ’74, in flower, 
CACTACEX. 
Opuntia Missouriensis, D.C. Specimens appear to belong to var. rufispina of En- 
glemann & Biglow’s Report in connection with the Pacific Railway. The 
plant is very variable, however, and no doubt other varieties are represented 
on the forty-ninth parallel. Near Wood Mountain, June 26, ’74, in flower. 
The plant comes very suddenly into bloom, and is very gay for a few days. 
In 74, from June 26 to July 3. Common everywiere, but especially char- 
acteristic of dry hills and barren valleys, with parched and clayey soil. 
From Wood End, Long. 103°, to near the E. Butte, Long. 111°. East and 
west of these points the rainfall increases, and it is probably this cause that 
limits the plant. Collected on the Saskatchewan, by Bourgeau. Macoun col- 
lected a cactus, which he refers doubtfully to this species, near Dunregan, on 
the Peace River. 
Mamillaria (Coryphantha) vivipara, Haw. Wood End, June 27, ’74. Near Wood 
Mountain, July 6,’74. Both in flower. Range similar to last, but not nearly 
so abundant. Berry edible, ripe in Sept. The flowers, before being dried, 
are not purple, but carmine. 
The locality furthest east where Cacti were observed, on the forty-ninth parallel, 
was on the plains near Turtle Mountain. The form there seen was not in flower, and 
did not appear to be growing luxuriantly. It was rare, and may be a depauperated 
variety of U. Missouriensis, but is probably distinct. Sir J. Richardson mentions the 
‘occurrence of a Cactus on the Lake of the Woods. He writes, ‘We gathered Opuntia 
Glomerata, or the Crapaud Verd, of the voyageurs, on the Lake of the Woods.” (Journ. 
Boat Voyage, Vol. I1., p. 277.) Though some time on the Lake of the Woods, I did not 
succeed in confirming the presence of this form, and from the dampness of the climate 
am led to suspect that some error in reference has occurred. 
GROSSULACE. 
Ribes aureum, (Pursh). West Fork Milk River, July 18, ’74. Fruit formed, but not 
ripe. Seen only at this place. 
Ribes rotundifolium, Mx. West Fork Milk River, July 18, ’74. Ripe fruit, 
Ribes floridum, L. Her. Dufferin, June 2, ’73, in flower. First crossing Souris River. 
June 3, ’74, in flower, Lake of Woods, &c. 
Ribes rubrum, L. Winnipeg, and N. W. Angle Road, July 4, ’73. Ripe fruit. 
Ribes cynosbati, L. Pembina Mountain (thicket), May 27, ’74, in flower, 
CUCURBITACEA, 
Echinocystis lobata, T. & 8. Lake of the Woods (boggy shore), July 8, ’73, in 
flower. Turtle Mountain, July 23, in flower, 
CRASSULACER. 
seracate gre tty: Pursh. Summits of three Buttes, or Sweet Grass Hills, July 
, 74, in flower. Rocky Mountains (6,000 to 7 000 feet), Aug. 18, 14, in 
ae 
Sedum rhodiola, D.C. Rocky Mountains (7,000 feet), Aug. 18, '74, past flowering. 
Sedum, Sp. 1. Kootanie Pass, dry bank. 
SAXIFRAGACER, 
Heuchera cylindrica, Doug. Kootanie Pass, Aug. 14, '74. With ripe seed. 
Heuchera Richardsoni, R. Br. Red River Prairie, June 18, '73, in flower, Abundant. 
From the Lake of the Woods, westward, 
