Attached is an example what could fit in an annotated catalogue of pollen
grains.
It is not difficult to document images of many or most pollens. I have
about 40 of these available in my collection representing Mid Atlantic
source.
It would be fascinating to collaborate with other amateurs and build a
reasonable online catalogue.
Realize however, that there are quite a few blooms that produce very similar
pollen grains and pollen sharing from a bloom does not often parallel the
bulk of nectar provided.
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