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Reproduction and variation in aconitum columbianum ranunculaceae with emphasis on california usa populations



Reproduction and variation in aconitum columbianum ranunculaceae with emphasis on california usa populations



American Journal of Botany 67(3): 263-273



Nectary depth in A. columbianum Nutt. in T. et G. shows little variation within populations but much continuous variation among populations. Mean nectary depth in populations studied ranges from 3.4 mm (SD = .+-.0.32) to 9.4 mm (SD = .+-.0.75). Correlations of nectary depths with the foraging behaviors and tongue lenths of bees visiting A. columbianum flowers indicate that populations with shallow nectaries are adapted to pollination by both short- and long-tongued bees. Bumblebee species with short tongues are not usually pollinators of flowers in populations with deep nectaries. Nectary depth is geographically correlated in California, and populations over large areas have similar nectary depths. Nectary depth is also correlated with bulbifery. Bulbiferous plants have strictly shallow nectaries, and are confined to 2 regions near the western extreme of the range of A. columbianum. The range of bulbiferous Aconitum in California is contiguous with the range of non-bulbiferous populations with shallow nectaries.

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Accession: 006315547

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