Status, Distribution & Conservation
The Monarch Butterfly, Danaus plexippus L., in Canada
Figure 2
The distribution and density of Milkweeds (Asclepias sp.) in Canada. Data from: Groh & Dore 1945; Roland & Smith 1969; Bhowmick & Bandeen 1976; Maher et al. 1978; Maher et al. 1979; Looman & Best 1979; White & Johnson 1980; Argus & Keddy 1984; Straley et al. 1985; Hinds 1986; Harms & Dunbar 1989; Argus & Pryer 1990; Day & Catling 1991.
