Abstract
Bidens ctenophylla andB. menziesii var.filiformis are two heterozygous, self-fertile but outcrossing, interfertile taxa. A relatively fertile intermediate population occurs on the “hybridized habitat” of a recent lava flow. This population contains some indi viduals which are similar toB. ctenophylla, some which are similar toB. menziesii var.filiformis, and many individuals of various intermediate forms. Variation studies of greenhouse populations of the two species, the F1 hybrid, the F2 hybrid, and the progeny of three wild intermediates confirm the field observation that the wild intermediate population is a product of natural hybridization betweenB. ctenophylla andB. menziesii var.filiformis. The analysis of two interspecific characters, stem anthocyanin and achene awns, indicates that each is polygenic and is regulated by relatively few genes.
Published Version
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