FIGURE 1.5. Representative species of Vanilla. (a) Vanilla phaeantha; (b) Vanilla kinabaluensis; (c) Vanilla aphylla; (d) Vanilla mexicana; (e) Vanilla mexicana in fruit with seeds that are visible; and (f) Vanilla odorata.
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Chapter 2. Evolutionary Processes and Diversifi cation in the Genus Vanilla
Séverine Bory, Spencer Brown, Marie-France Duval, and Pascale Besse
Introduction
The diversity of the genus Vanilla Plumier ex Miller appears complex at many levels. First, its taxonomy is confused and species delimitation is unclear. Second, at the intraspecific level, genetic diversity is often not correlated with phenotypic diversity. At the moment, a considerable amount of data is available, providing new insights on the possible evolutionary processes responsible for the evolution and diversification of the genus. These processes are detailed and their implication for vanilla conservation and improvement are discussed.