THE BIOLOGY OF CANADIAN WEEDS: 19. Asclepias syriaca L.

Abstract
Biological data is summarized for common milkweek (A. syriaca L.), as a weed in Canada, particularly in E Canada. Weedy populations of this perennial occur in great abundance in southern Ontario and Quebec. It belongs to association of plants of roadsides, waste lands and river basins. Recently, this weed has spread into cultivated lands, especially cereals, row crops and forage crops.

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