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Systematics, Phylogeny and Evolution of Dietes (Iridaceae)

Peter Goldblatt
Annals of the Missouri Botanical Garden
Vol. 68, No. 1 (1981), pp. 132-153
DOI: 10.2307/2398817
Stable URL: http://www.jstor.org/stable/2398817
Page Count: 22
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Systematics, Phylogeny and Evolution of Dietes (Iridaceae)
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Abstract

Dietes is a member of Iridaceae-Iridoideae and is probably the most primitive member of the Old World tribe Irideae. It shares characteristics of both Iris and the African genus Moraea and is most likely close to the ancestral stock that gave rise to these more specialized genera. Dietes comprises six species, five African and one remarkable disjunct on Lord Howe Island between Australia and New Zealand, D. robinsoniana. The South African D. bicolor appears more closely related to D. robinsoniana than to the other African species, and these two share several characters primitive in the genus. The remaining four African species include the wide-ranging D. iridioides, which extends from the southern Cape to Ethiopia, and three more localized eastern southern African species.

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