What are the bes visiting this time of year?

Curtis Gentry was kind enough to answer this question for me.

Mahonia 

 Alder

 chickweed

Maple

Rosaceous

there could be other stuff too -- this is what comes to mind first --
as you might note, pollen color can range quite a bit as there are often multiple species in many of these listings -- i would suspect the avocado green is likely alder or some species of maple (there are several species of maple out there with red maple being the earliest to bloom which tends more toward yellowish/creamish, as i recall -- the approach to verify this would be to find a bee collecting pollen on the respective plant and compare -- there is an alder shrub near the apiary in the Oakhurst Garden -- the Bee Team will look tomorrow --