According to observations of naturalists and beekeepers.
Where are you?
Park willow occurs in the middle and southern Rocky Mountain region from Wyoming to New Mexico.
This plant is present in at least 5 states/provinces in this country.
Park willow is a native, erect shrub 3 to 12 feet (1.5-4 m) tall, and usually forming dense clumps. The trunk of park willow is smooth or slightly cracked. The wood is fine-grained and soft and has no sapwood-heartwood line. Park willow has a remarkable characteristic of plasticity; its growth form adapts readily to a wide variety of habitats. Branching habit and foliage characteristics vary greatly depending on site conditions.
Park willow flowers in May, before the leaves appear, through July. The fruit ripens soon after flowering, followed by seed dispersal in early to midsummer.
Acer saccharinum (aka: Silver maple, Soft maple)
Cercis canadensis (aka: Eastern redbud, Redbud, Cersis Reniformis)
Salix gooddingii (aka: Goodding's willow, Dudley willow, Valley willow, Western black willow)
Prunus serotina (aka: Black cherry, Wild black cherry, Rum cherry, Mountain black cherry, Wild cherry)
Celtis laevigata (aka: Hackberry, Sugarberry, Lowland hackberry, Sugar hackberry, Arizona sugarberry, Netleaf hackberry, Small's hackberry, Southern hackberry, Texas sugarberry)
Pyrus communis (aka: European pear, Common pear)
Acer negundo (aka: Boxelder, Western boxelder, Arizona boxelder, California boxelder, Texas boxelder, Interior boxelder, Violet boxelder)
Ungnadia speciosa (aka: Mexican buckeye, Texas buckeye, Canyon buckeye, Spanish buckeye, New Mexican buckeye, New Mexico buckeye, False buckeye, Monillo, Monilla)
Acer glabrum (aka: Rocky Mountain maple, Douglas maple, Greene's maple, New Mexico maple, Torrey maple)
Salix lucida (aka: Shining willow, Greenleaf willow, Tail-leaf willow, Whiplash willow, Pacific willow, Lance-leaf willow, Longleaf willow, Red willow, Western shining willow)