Abstract
In a population of P. quinquefolium in southeastern New York [USA] reproductive individuals produce bisexual flowers with either a 2-styled ovary containing 2 ovules or a 1-styled ovary containing a single ovule. The number of flowers produced, the ratio of 2 to 1 styled flowers, and the percentage of ovules maturing into seeds all increase with plant size. Flowers are capable of autogamy. Xenogamy is effected by syrphid flies and halictid bees. Fecundity appears to be regulated by the availability of resources.

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