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Pollination Biology and the Breeding System of Acacia Retinodes (Leguminosae: Mimosoideae)

P. Bernhardt, J. Kenrick and R. B. Knox
Annals of the Missouri Botanical Garden
Vol. 71, No. 1 (1984), pp. 17-29
DOI: 10.2307/2399054
Stable URL: http://www.jstor.org/stable/2399054
Page Count: 13
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Pollination Biology and the Breeding System of Acacia Retinodes (Leguminosae: Mimosoideae)
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Abstract

Coastal populations of Acacia retinodes Schldl. var. uncifolia J. M. Black are protogynous and highly self-incompatible. Flowers are nectarless but insects appear to be attracted to the inflorescences both by the yellow floral color and distinctive fragrance. Neutral red tests suggest that the scent originates from the stigma and epidermal cells of the anthers. Floral foragers represented three insect orders but interpretations of field observations and pollen load analysis of insects indicate that solitary bees in the Colletidae and Halictidae are the major pollen vectors. The method for removal of pollen from the anthers is via thoracic vibration. Because female phase flowers offer no pollen, foraging by bees on such flowers is interpreted as a trend towards partial pollination by deceit.

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