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A New Species of Ipomoea (Convolvulaceae) from Mexico State, Mexico, and Its Evolution

Paul Wilkin
Kew Bulletin
Vol. 50, No. 1 (1995), pp. 93-102
Published by: Springer on behalf of Royal Botanic Gardens, Kew
DOI: 10.2307/4114611
Stable URL: http://www.jstor.org/stable/4114611
Page Count: 10
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A New Species of Ipomoea (Convolvulaceae) from Mexico State, Mexico, and Its Evolution
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Abstract

A new species, Ipomoea temascaltepecensis, is described from Mexico State, Mexico. It is closely related to I. ampullacea Fernald, with which it shares a woody, climbing habit, trilocular ovaries, tough, ovate, subherbaceous sepal bases, foliaceous bracts and an externally pubescent corolla. The new species is distinguished by shorter (15-28 mm long) sepals, an infundibular purple corolla, and shorter, included, heteromorphic stamens. The probable sister-taxon status of the new species to the moth-pollinated I. ampullacea is discussed in terms of the morphological differences between them, including pollen grain morphology. The role of pollination biology in speciation in Ipomoea is also considered.

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