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The Reproductive Biology of Agavaceae: I. Pollen and Nectar Production in Four Arizona Agaves

William M. Schaffer and M. Valentine Schaffer
The Southwestern Naturalist
Vol. 22, No. 2 (Jun. 3, 1977), pp. 157-167
DOI: 10.2307/3669806
Stable URL: http://www.jstor.org/stable/3669806
Page Count: 11
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The Reproductive Biology of Agavaceae: I. Pollen and Nectar Production in Four Arizona Agaves
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Abstract

The rates and timing of nectar and pollen production in four species of agaves were studied. Two species (Agave palmeri and A. schottii) were found to be primarily nocturnal producers and additionally were shown to secrete relatively unconcentrated nectars. The remaining species (A. toumeyana and A. parviflora) produce nectar and pollen primarily during the daytime. The adaptive significance of these and related variations is discussed.

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