 Once there, its perennial forms spread primarily in human-disturbed environments (Leger and Rice, 2003).The introduced Chilean populations of California poppy appear to be larger and more fecund in their introduced range than in their native range (Leger and Rice, 2003).Introduced populations have been noted to be larger and more reproductively successful than native ones (Elton, 1958), and there has been much speculation as to why.