Queen 18 - 21 mm
Workers 11 - 17 mm
Male 13 - 16 mm
Cirsium, Dipsacus, Helianthus, Penstemon, Phacelia, Trifolium
Nests often built underground, on the ground surface, or above ground in deserted rodent nests
American Bumble Bee (B. pensylvanicus)
Nevada Bumble Bee (B. nevadensis)
Other regions :
Northern Amber Bumble Bee (B. borealis) --> Canadian Maritimes and eastern US in Temperate and Boreal Forests regions
Northern Yellow Bumble Bee (B. distinguendus) --> Alaska