flavifrons Cresson more often visited Aconitum columbianum Nuttall (mean corolla tube length = 8.
flavifrons worker bees on Delphinium barbeyi and Aconitum columbianum, testing whether the two bee species had equal rates of nectar gain from the two flower types under controlled conditions.
3) Are Delphinium barbeyi and Aconitum columbianum inflorescences visited equally by pollinator species in the field?
The two plant species, Aconitum columbianum and Delphinium barbeyi, overlapped in habitat and time of flowering.
Each site contained a mixed patch of Delphinium barbeyi and Aconitum columbianum, although there were different ratios of the two plant species at the four sites.
Handling times for Bombus flavifrons were approximately equal on flowers of Aconitum columbianum and Delphinium barbeyi, whereas B.
appositus gained significantly more nectar per second on the longer-tubed flowers of Delphinium barbeyi than on the shorter-tubed Aconitum columbianum flowers.