12 



LITERATURE CITED 



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Doyle, J.J., J.L. Doyle, and A.H.D. Brown, 1990. A chloroplast DNA phylogeny of the wild 

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Ruber, W., and A. Leuchtmann, 1992. Genetic differentiation of the Erigeron species 

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, and W.A. Weber, 1983. A new woolly-headed monocephalous Erigeron 



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