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This paper was presented in both Symposia published in this issue of the Annals of the Missouri Botanical Garden â€" the Symposium on Plant Geographical Results of Changing Cenozoic Barriers at the XIII International Botanical Congress in Sydney, Australia, 1981; and the 1981 Systematics Symposium of the Missouri Botanical Garden. As used herein, references documented as "this symposium" include papers from both symposia.2 This paper stems largely from insights developed during field work over a number of years in various parts of Latin America, and

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