In June, Himalayan blackberry pollen is by far the most common in my beehives.
Microscopic Images at x800 Magnification
Himalayan blackberry (Rubus armeniacus), 6/8/23
Tulip tree (Liriodendron tulipifera), 6/23/21
Black locust (Robinia pseudoacacia), 6/1/23
Unidentified maple-like pollen, 6/15/23
Chestnut (Castanea species or hybrid), 6/27/20
Buckthorn family, 6/3/22
Probably cascara (Frangula purshiana) or California lilac (Ceanothus)
Common poppy (Papaver rhoeas), 6/3/20
Rockrose (Cistus hybrid), 6/23/20
Staghorn sumac (Rhus typhina), 6/18/19
Japanese snowbell (Styrax japonicus), 6/2/20
Southern magnolia (Magnolia grandiflora), 6/16/21
Birdsfoot trefoil (Lotus corniculatus), 6/11/21
California poppy (Eschscholzia californica), 6/9/19
Hawthorn (Crataegus species or hybrid), 6/2/24
Privet (Ligustrum species), 6/30/20
Walnut (Juglans species), 6/3/21
St. John's wort (Hypericum species), 6/24/19
Kousa dogwood (Cornus kousa), 6/15/18
Cotoneaster? (Cotoneaster species?), 6/26/22
Windmill palm (Trachycarpus fortunei), 6/2/21
White clover (Trifolium repens), 6/25/20
Multiflora rose? (Rosa multiflora), 6/13/18
Asparagus (Asparagus officinalis), 6/13/21
English holly (Ilex aquifolium), 6/6/22
Scale