128 
R. mexicanus Meisn, Willow-leaved Dock. * 
Common in damp meadows and sioughs throughout the area. Col- 
lected in flow r er from the middle to the last of July, and in fruit during 
the first half of August. 
East shore of lake Mamawi, Nos. 2225, 2227 ; lower delta of Atha- 
baska river, No. 670; near Round lake, about 18 miles south of Pine lake, 
No. 2224; Peace point, No. 2228; base of eastern slope of Caribou moun- 
tains, No. 2226. 
R. maritimus L., var. fueginus (Phil.) Dusen. See Rhod. xvii, 73(1915). Golden 
Dock. 
Common in damp meadows and slough margins. In flower in mid- 
July and in fruit during the latter part of August. 
Lower delta of Athabaska river, No. 673; Murdock Creek district, No. 
2221; Government Hay Camp district, Slave river, Nos. 2220, 2222; near 
Heart (Raup) lake, No. 2219; sink-hole 16 miles east of Moose (Eight) 
lake, No. 2218; Moose (Eight) Lake district, Nos. 2217, 2223; Little 
Buffalo river, Russell, No. 29. 
Polygonum prolificum (Small) B. L. Robinson. 
Apparently rare or occasional, and confined to the Salt Plain region. 
Bulblets maturing when the specimens were collected August 19. 
Near Heart (Raup) lake, No. 2229. 
P. avioulare L. Knotweed. 
Common in damp sloughs and rock crevices, and in cabin clearings 
throughout the lowlands. Occasional in the upland districts. It may be 
adventive, as suggested by its nearly complete limitation to the routes of 
travel. In flower during the last w r eek in June, and in various stages of 
flower and fruit through July and August. 
Reed portage, upper Embarras river, No. 2234; east shore of lake 
Mamawi, No. 2233; Government Hay Camp district, Slave river, No. 2232; 
Fort Smith, No. 658; sink-hole 16 miles east of Moose lake, No. 2235. 
P. viviparum L. Bistorta vivipara (L.) S. F. Gray. Bistort. 
Apparently occasional in the park area, and collected thus far only in 
small meadow openings and muskegs. Collected with flowers and imma- 
ture bulblets during the latter part of June and the first of July. 
Pine Lake district, Nos. 2230, 2231. 
P. lapathifolium L.. var. salicifolium Sibth, P. tomentosum Schrank, var. incanum 
(Schmidt) Giirke. See Rhod. xxiii, 259 (1921). 
Occasional on damp slough margins. Collected in flower in mid-July 
and early August, and with immature fruit August 20. 
East shore of lake Mamawi, No. 2254; Round lake, about 18 miles south 
of Pine lake, No. 2253; sink-hole 16 miles east of Moose lake, No. 2252. 
