This work was supported in part by Graduate Assistance in Areas of National Needs (GAANN)Fellowship,United States National Science Foundation Grants,a John Simon Guggenheim Memorial Fellowship awarded to N.C.ELLSTRAND,a grant from the Elvenia J.SLOSSON Endowment Fund awarded to J.S.HOLT,and a UC Dissertation Year Fellowship
The history of some invasive species is so complex that their origins can be difficult to determine. One example of such invasive species is the California invasive known as "wild artichoke thistle" (Cynara cardunc...