Alderleaf buckthorn is a bushy fruiting shrub found on riverbanks, meadows, and moist areas. Its native habitat is southern Canada and Northern United States; unlike the invasive buckthorn (Rhamnus cathartica).
The leaves are narrowly ovate to narrowly elliptic and granular toothed. Stems are gray and smooth. Small green shallowly bell-shaped flowers appear on the from June to July. They're either solitary or in umbels (of up to three) and are either male or female (dioecious). Bluish-black three seeded berries follow (drupes). The flowers and fruit attract wildlife such as birds, butterflies and moths.
Giblin, D., Burke Museum Herbarium. (n.d.). Rhamnus alnifolia. Retrieved from http://biology.burke.washington.edu/herbarium/imagecollection/taxon.php?Taxon=Rhamnus%20alnifolia
Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. Rhamnus alnifolia L'Hér. Retrieved from http://linnet.geog.ubc.ca/Atlas/Atlas.aspx?sciname=Rhamnus+alnifolia
California Native Plant Society. (n.d.). Alder Buckthorn. Retrieved from https://calscape.org/Rhamnus-alnifolia-(Alder-Buckthorn)?srchcr=sc59037f3eb7047
Natural Resource Conservation Service. (n.d.). Rhamnus alnifolia L'Hér. Retrieved from https://plants.usda.gov/core/profile?symbol=RHAL