All 89 bee plants
Dandelion pollen
Taraxacum officinale
Deep orange, in the orange range.
FloweringMarch to October, peak April to May
PollenVery good
NectarYes
SeasonSpring, Summer, Autumn
WhereGarden, Farmland, Waste and verge
Unmistakable, and a huge boost through the spring.

Easy to mistake for these
Closest pollen colours in our set, measured the same way the pollen identifier scores a match. Colour alone will not settle it, so check the flowering months and what is actually growing near your hives.
Out at about the same time
Saw a load like this going in?
Sample the colour against all 89 plants, then keep a forage record per hive.