According to observations of naturalists and beekeepers.
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Feltleaf willow is native to northern North America and eastern Siberia. In North America, it occurs from Alaska south to British Columbia to about 53 °N latitude, east to Québec, and north to Nunavut.
This plant is present in at least 8 states/provinces in this country.
Feltleaf willow is a tree or shrub 2 to 33 feet (0.5-10 m) tall. It typically grows in clumps of 5 to 20 stems. Branches are typically erect, but in exposed High Arctic and alpine sites feltleaf willow may have a prostrate or semiprostrate form. Trunks maybe 4 to 7 inches (10-18 cm) in diameter. Heavy browsing commonly hedges feltleaf willows.
Leaves are deciduous, alternate, and simple. They are 2.0 to 4.3 inches (5-11 cm) long and 0.4 to 1.6 inches (1-4 cm) wide.
The inflorescence is a catkin. Male catkins are 1.2 to 2.0 inches (3-5 cm) long, and female catkins are 2.0 to 5.9 (5-15 cm) long. The fruit is a capsule, which splits open to release the seeds. A tuft of hairs plumes each seed.
Willow roots are typically shallow. Feltleaf willow sometimes forms adventitious roots.
Feltleaf willow stands are open to closed. Closed feltleaf willow stands (canopy closure >75%) are characteristic of floodplains and outwash deposits, while open feltleaf willow stands (canopy closure 25%-74%) occupy a variety of sites from sand dunes to riverbanks.
Feltleaf willow catkins appear and pollination occurs in spring before leaves emerge. In Alaska, flowering and seed dispersal occur from May to July. In general, seeds are dispersed later as latitude and elevation increase. Seed dispersal often coincides with receding spring floodwaters, when newly exposed mineral soil seedbeds are moist. Feltleaf willow is often one of the first willows to disperse seeds in interior Alaska. The rate of seed dispersal in willows depends on weather. Under warm, dry, windy conditions, all seeds may be dispersed within a few days. Under wet, cool conditions, dispersal may be spread out over a month.
Acer negundo (aka: Boxelder, Western boxelder, Arizona boxelder, California boxelder, Texas boxelder, Interior boxelder, Violet boxelder)
Pyrus communis (aka: European pear, Common pear)
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)
Rubus spectabilis (aka: Salmonberry)
Salix discolor (aka: Pussy willow, American pussy willow, Glaucous willow, Large pussy willow)
Salix exigua (aka: Narrowleaf willow, Coyote willow)
Prunus cerasus (aka: Sour cherry, Tart cherry, Dwarf cherry, Montmorency cherry)
Crataegus douglasii (aka: Black hawthorn, Douglas hawthorn, River hawthorn, Western thornapple)
Populus tremuloides (aka: Quaking aspen, Trembling aspen, Aspen, American aspen, Mountain aspen, Golden aspen, Trembling poplar, White poplar, Popple, Alamo Blanco)
Salix scouleriana (aka: Scouler's willow, Upland willow)
Acer circinatum (aka: Vine maple)
Prunus emarginata (aka: Bitter cherry)
Malus fusca (aka: Oregon crab, Oregon crab apple, Pacific crab apple, Western crab apple)
Salix arbusculoides (aka: Littletree willow)
Salix bebbiana (aka: Bebb willow, Beak willow, Beaked willow, Long-beaked willow, Diamond willow, Chaton, Petit Minou, Smooth Bebb willow)
Malus domestica (aka: Pyrus pumila, Malus pumila, Apple)
Acer macrophyllum (aka: Bigleaf maple, Big-leaf maple, Oregon maple)
Acer platanoides (aka: Norway maple)
Rubus ursinus (aka: California blackberry, California dewberry, California grapeleaf dewberry, Douglasberry, Pacific blackberry)
