According to observations of naturalists and beekeepers.
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SOURCE FOR HONEY BEES:
This plant is present in at least 47 states/provinces in this country.
The alternate, double-toothed leaves are 2 to 5 inches (5-10 cm) long and 1 to 3 inches (2.5-7.5 cm) wide. The dark gray bark is deeply furrowed. The perfect flowers are borne in dense clusters of three or four fascicles. The fruit is a samara consisting of a compressed nutlet surrounded by a membranous wing.
Brassica napus (aka: Rapeseed)
Salsola kali (aka: Russian thistle, Tumbleweed, Prickly saltwort)
Echium vulgare (aka: Viper's bugloss, Blueweed, Blue thistle)
Rubus idaeus (aka: Raspberry, Black-haired red raspberry, Brilliant red raspberry, American red raspberry, Red raspberry, Smoothleaf red raspberry, Wild raspberry, Wild red raspberry, Grayleaf raspberry)
Cucumis sativus (aka: Cucumber, Cetriolo, Gherkin)
Citrullus lanatus (aka: Watermelon)
Aralia spinosa (aka: Devil's walkingstick, Prickly ash, Hercules club, Angelica tree, Prickly elder, Pick tree, Toothache tree, Shotbush)
Hyssopus officinalis (aka: Hyssop)
Cirsium arvense (aka: Creeping Thistle, Canada thistle, Field thistle, California thistle, Lettuce from hell thistle, Corn thistle, Cursed thistle, Green thistle, Hard thistle, Perennial thistle, Prickly thistle, Small-flowered thistle, Way thistle, Stinger-needles)
Asteraceae (aka: Aster, Daisy, Composite)