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Phylogeny and Biogeography of the Ormocarpum Group (Fabaceae): A New Genus Zygocarpum from the Horn of Africa Region

Mats Thulin and Matt Lavin
Systematic Botany
Vol. 26, No. 2 (Apr. - Jun., 2001), pp. 299-317
Stable URL: http://www.jstor.org/stable/2666709
Page Count: 19
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Phylogeny and Biogeography of the Ormocarpum Group (Fabaceae): A New Genus Zygocarpum from the Horn of Africa Region
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Abstract

The genus Zygocarpum is described with six species formerly of Ormocarpum. This genus is endemic to the Horn of Africa, the southern end of the Arabian Peninsula, and the island of Socotra. Analysis of combined nuclear ribosomal ITS/5.8S and morphological data reveals that Zygocarpum is strongly supported as monophyletic and the basal-most lineage of a mainly African-Madagascan clade comprising also Ormocarpum, Ormocarpopsis, and Peltiera. A second analysis involving a combination of nuclear ribosomal ITS/5.8S, chloroplast trnL intron, and morphological data reveals some well supported relationships among the species of Zygocarpum. Zygocarpum dhofarense and Z. yemenese, endemic to the Arabian Peninsula, form a sister clade to the central Somalian Z. gillettii. The precise relationships among the other two Somalian species, Zygocarpum rectangulare and Z. somalense, as well as the endemic Socotran Zygocarpum coeruleum, are less certain. The distribution of Zygocarpum, which spans the Gulf of Aden, is considered to be due to a Late Tertiary vicariant event involving the separation of the Arabian Peninsula from continental Africa.

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