Abstract
Few data on floral development and morphology are available for the monotypic Australian genus Davidsonia. New data on floral form and development are presented for Davidsonia, and comparisons are made to allied clades. Phylogenetic analysis allies Davidsonia with core Cunoniaceae. Flower maturation on each branch of the cauliflorous inflorescences is basipetal, beginning with the terminal flower. Flowers are hypogynous, radially symmetrical, and have a uniseriate perianth that consists of a campanulate calyx. Davidsonia has been traditionally allied with Cunoniaceae, and it shares various basic floral attributes, especially gynoecial states, with some members of this family. The bicarpellate gynoecium of Davidsonia has an ovary that is completely synorganized and biloculate, two separate styles that have prominent ventral commissures, and terminal, papillate stigmas. Davidsonia differs most from core Cunoniaceae in androecial morphology, including the development of the androecium and the form of stamens. The stamens of Davidsonia display a mosaic of states present among members of Oxalidales (including Cephalotaceae, Cunoniaceae, Elaeocarpaceae, and Tremandraceae) in which the genus is nested. Although Davidsonia shares various floral states with Cunoniaceae, it can best be perceived as displaying a mosaic of features that occur more broadly among Oxalidales.Key words: Cunoniaceae, Davidsonia, flower development, morphology, Oxalidales.
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