140 
A. retrofracta Gray. 
Occasional in dry prairies and upland woods, or on exposed sandy banks. 
In flower June 20, and maturing fruits during the first week in July. 
Pine Lake district, Nos. 2489, 2491 ; Peace point, No. 2490. 
A. hirsuta (L.) Scop. Hairy Rock Cress. 
Common in upland prairies and clearings. Found in flower during the 
latter half of June, and in fruit during the latter half of July and August. 
Near Mission Farm, No. 2497; Pine Lake district, Nos. 2496, 2498, 2499; 
Peace point, No. 2500; sink-hole 16 miles east of Moose lake, No. 2495; base 
of eastern slope of Caribou mountains, Nos. 2492, 2493, 2494. 
DROSERACEAE 
Drosera rotuxidifolia L. Sundew. 
Apparently rare or occasional in the park area, and known thus far 
only from two specimens collected in an upland muskeg. Flowers were not 
quite out on July 9, Said to be poisonous to cattle. 
Pine Lake district, No. 2515. 
SAXIFRAGACEAE 
Saxifraga tricuspidata Rottb. Leptasea iricuspidata (Rottb.) Haw, Saxifrage. 
Common on granite hills in Athabaska-Peace delta and along upper 
Slave river. Collected in flower June 9, and with a few late flowers August 
7-8. Fruit is matured in August and probably earlier. 
East shore of lake Mamawi, No. 2568; along Q.uatre Fourches river, No. 
826; Government Hay Camp district, Slave river, No. 2567. 
Heuchera Richartlsonli R.Br, See Rhod. xxxv, 111-19 (1933). Alum Root. 
Common on the granite hills in Athabaska-Peace delta, where new 
rosettes were found June 9, and late flowers and maturing fruit August 8-9. 
Along Quatre Fourches river, No. 847 ; east shore of lake Mamawi, No. 
2550. 
Mitella nuda L. Bishop’s Cap. 
A common species of rich spruce or spruce-poplar woodlands and tim- 
bered muskegs throughout the region. It usually grows in a thick mat of 
mosses. Collected in flower in the latter half of June and the first half of 
July. Fruits are matured in late July and in August. 
30th base line, Slave river, No. 815; Government Hay Camp district, 
Slave river, No. 2562; Pine Lake district, No. 2563; Peace point, No. 2561; 
Moose (Eight) Lake district, No, 2564; base of eastern slope of Caribou 
mountains, No. 2566; eastern edge of Caribou Mountain plateau, No. 2565; 
Little Buffalo river, Russell, No. 83. 
Chrysosplenium tetrandrum Fries. Golden Saxifrage. 
Rare or occasional in the park area, and found thus far only in a single 
upland muskeg. Collected with flowers and immature fruits June 20. 
Pine Lake district, No. 2551. 
