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Entomophilous Pollination of the Self-Compatible Species Collinsia sparsiflora Fisher and Meyer

Richard W. Rust and Stephen L. Clement
Journal of the Kansas Entomological Society
Vol. 50, No. 1 (Jan., 1977), pp. 37-48
Stable URL: http://www.jstor.org/stable/25082899
Page Count: 12
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Entomophilous Pollination of the Self-Compatible Species Collinsia sparsiflora Fisher and Meyer
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Abstract

Collinsia sparsiflora Fisher and Meyer is an autogamous annual with nectariferous, zygomorphic flowers that exhibit a UV reflectance-absorbance pattern and are sternotribic. The extent and effectiveness of insects in cross pollinating the flowers was investigated for three populations, one early blooming and two mid- to late-season blooming. Apis mellifera L., Bombus species and Osmia species were the principal pollinators. Their density never exceeded one $\text{pollinator}/{\rm m}^{2}/\text{minute}$ and their distribution in all three populations was Poisson. The probability of a flower not being cross-pollinated in the early blooming population was estimated at 0.60 and 0.36 for the two later blooming populations. Autogamy insures seed production in the early blooming population, but is less important in later blooming populations.

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