Summary of Cytological Information on Emilia and the Taxonomy of Four Pacific Taxa of Emilia (Asteraceae: Senecioneae)

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Abstract
The central Pacific area has four taxa of Emilia: E. coccinea, E. fosbergii, E. sonchifolia var. sonchifolia, and E. sonchifolia var. javanica. The first three are widespread in the neotropics and intermediates do not occur. In the central Pacific intermediates are found where E. fosbergii and E. sonchifolia var. javanica are sympatric and, presumably, hybridize. A confusing complex exists in the western Pacific and eastern Asia, apparently because E. sonchifolia var. javanica hybridizes with at least one native species, such as E. prenanthoidea. The paper includes a discussion of morphological characteristics, keys and synonymy of the four taxa, and a survey of the literature on cytology and breeding systems in Emilia.

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