139 
E. parviflorum Nutt. 
Occasional and apparently confined to dry upland prairies. Found 
with flowers and immature fruit July 17, and with flowers and mature fruit 
August 20, 
Near Heart (Raup) lake, No. 2478; Peace point, No. 2479. 
Rorippa obtusa (Nutt.) Britton, Radicula oblusa (Nutt.) Greene. 
Apparently rare, and found thus far only in a crevice on a granite hill 
in the Peace delta. Collected with flowers and maturing fruit August 16. 
East shore of lake Mamawi, No. 2514. 
R. palustris (L.) Bess., var. glabrata (Lunell) Victorin, See Jour. Bot. xlii, 225 (1924), 
and Cont. Lab. de Bot. Univ. Montreal, No. 17 (1930). Water-cress, Marsh 
Cress. 
Common on the wet shores of lakes and sloughs throughout the park 
area. In some lowland sloughs it makes the predominating vegetation at the 
water’s edge, where it is actively colonizing new areas by vegetative means. 
Flowers collected as early as June 16 and throughout the summer, whereas 
maturing fruit is not commonly found until late July or early August. 
30th base line, Slave river. No. 800; Murdock Creek district, No. 2507; 
Government Hay Camp district, Slave river, Nos. 2506, 2509; Round lake, 
about 18 miles south of Pine lake, No. 2510; Peace point, No. 2508; sink- 
hole 16 miles east of Moose lake, No. 2511 ; Moose (Eight) Lake district, 
Nos. 2502, 2503, 2504, 2505; Indian graveyard, Peace river, No. 2513; base 
of eastern slope of Caribou mountains, No. 2512. 
R. palustris (L.) Bess., var. hispida (Desv.) Rydb. Radicula hispida (Desv.) Britton ; 
R. palustris (L.) Moench, var. hispida (Desv.) Robinson. 
Apparently occasional in the area, and found thus far only in a wet 
prairie on the Salt Plains. In fruit August 20. 
Near Heart (Raup) lake, No. 2501. 
Cardamine pennsylvanica Muhl. Bitter Cress. 
Common in upland muskegs, w ? here it was collected with flowers and 
immature fruit June 20 and July 11. 
Pine Lake district, Nos. 2480, 2481. 
Arabis lyrata L. 
Occasional in upland meadows and on dry ridges. Collected with 
flowers and well-developed pods in mid- June and mid- July. 
Near Mission Farm, No. 2484; Moose (Eight) Lake district, No. 2485, 
A. brachycarpa (T. and G.) Britton. 
Apparently rare, and known only from the following locality, where it 
had immature fruit June 26. 
Pine Lake district, No. 2486. 
A. Drummondi Gray. Rock cress. 
Occasional in upland prairies and open woods. Collected in flower 
June 15. 
Near Mission Farm, No. 2487; Pine Lake district, No. 2488. 
