A Reassessment of the Familial Affinity of the Mexican Genus Recchia Mocino & Sesse ex DC.

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Abstract
Sequence data for the rbcL locus were obtained for two of the three species of the Mexican endemicRecchia. Parsimony analyses of the molecular data base indicate that Surianaceae sensu Cronquist are paraphyletic; inclusion ofRecchia rendered the family monophyletic. This placement is corroborated by a suite of morphological characters: an apocarpous (or monocarpic), gynoecium of bi-ovulate carpels with basal-marginal placentation and a ventrobasal style, and the occurrence in all butGuilfoylia of a characteristic 3-layered endocarp. The molecular data support a closer relationship betweenRecchia and the AustralianCadellia than between the latter and any of the other Australian genera. The molecular data suggest that the affinities of Surianaceae lie in a clade comprising at least Polygalaceae, Fabaceae, andQuillaja.

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