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Salix prolixa

Salix prolixa Andersson

Mackenzie's Willow, Mackenzie Willow

Salicaceae (Willow Family)

Synonym(s): Salix cordata var. mackenzieana, Salix eriocephala ssp. mackenzieana, Salix eriocephala var. mackenzieana, Salix mackenzieana, Salix mackenzieana var. macrogemma, Salix rigida ssp. mackenzieana, Salix rigida var. mackenzieana, Salix rigida var. macrogemma

USDA Symbol: SAPR3

USDA Native Status: L48 (N), AK (N), CAN (N)

Shrub or small tree with slender trunk, upright branches, and narrow crown.

This species was first found along the Mackenzie River, which was discovered by Alexander Mackenzie (1755?-1820), the Scottish fur trader and explorer.


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Plant Characteristics

Duration: Perennial
Habit: Tree
Leaf Retention: Deciduous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Fruit Type: Capsule
Size Notes: Up to about 15 feet tall.

Bloom Information

Bloom Color: Yellow , Green , Purple
Bloom Time: Feb , Mar , Apr , May , Jun


USA: AK , CA , ID , MT , NV , OR , UT , WA , WY
Canada: AB , BC , SK
Native Distribution: S. Mackenzie and SE. Yukon south in mountains to Sierra Nevada of central California and N. Utah; from near sea level in north; to 7000' (2134 m) in south.
Native Habitat: Wet soils of stream borders and swamps; in coniferous forests.

Value to Beneficial Insects

Special Value to Native Bees
Special Value to Bumble Bees
Special Value to Honey Bees

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Salix prolixa in USDA Plants
FNA: Find Salix prolixa in the Flora of North America (if available)
Google: Search Google for Salix prolixa


Record Modified: 2023-05-16
Research By: TWC Staff

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