According to observations of naturalists and beekeepers.
Where are you?
Diamondleaf willow grows from the southern Yukon Territory south to California and New Mexico, and east across boreal Canada to eastern Canada and New England. It is restricted to mountainous terrain in the western United States.
This plant is present in at least 29 states/provinces in this country.
Diamondleaf willow is a small-to-medium-sized deciduous shrub. The bark is gray and smooth. The flowers occur in about 1- to 2-inch-long (2.5 cm), erect catkins on the previous year's twigs.
Diamondleaf willow flowers appear in the spring before or sometimes with the leaves.
Acer rubrum (aka: Red maple, Scarlet maple)
Acer saccharinum (aka: Silver maple, Soft maple)
Aronia arbutifolia (aka: Red chokeberry)
Amelanchier arborea (aka: Common serviceberry, Downy serviceberry, Juneberry, Shadbush, Shadblow, Sugarplum)
Salix discolor (aka: Pussy willow, American pussy willow, Glaucous willow, Large pussy willow)
Salix nigra (aka: Black willow, Swamp willow, Southwestern black willow, Gulf black willow, Scythe-leaved willow)
Pyrus communis (aka: European pear, Common pear)
Acer negundo (aka: Boxelder, Western boxelder, Arizona boxelder, California boxelder, Texas boxelder, Interior boxelder, Violet boxelder)
Populus tremuloides (aka: Quaking aspen, Trembling aspen, Aspen, American aspen, Mountain aspen, Golden aspen, Trembling poplar, White poplar, Popple, Alamo Blanco)
Salix lucida (aka: Shining willow, Greenleaf willow, Tail-leaf willow, Whiplash willow, Pacific willow, Lance-leaf willow, Longleaf willow, Red willow, Western shining willow)
