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Floral divergence and convergence in the genus Pelargonium (Geraniaceae) in southern Africa: ecological and evolutionary considerations

M. Struck
Plant Systematics and Evolution
Vol. 208, No. 1/2 (March 1997), pp. 71-97
Published by: Springer
Stable URL: http://www.jstor.org/stable/23643319
Page Count: 27
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Floral divergence and convergence in the genus Pelargonium (Geraniaceae) in southern Africa: ecological and evolutionary considerations
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Abstract

Based on field observations and a survey of the available literature, the functional and evolutionary significance of floral characters of Pelargonium is investigated in relation to a recent infrageneric re-classification. Most of the 208 Pelargonium taxa (recognized as species, subspecies or varieties) involved show bee and long-proboscid hovering fly pollination syndromes (about 60% and 25%, respectively), only 7% of the taxa are pollinated by butterflies, some 2 to 4% by hawkmoths and presumably 1% by birds. The heterogeneity of Pelargonium in terms of structural blossom types and pollination syndromes indicates an independent and repeated evolution of convergent flower morphs in the genus and even in sections.

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