Photograph from Lewis and Clark Herbarium/Academy of Natural Sciences
Black Hawthorn (River Hawthorn)
April 29, 1806, along the Walla Walla River, Washington.
Small tree with compact, rounded crown of stout, spreading branches; often a thicket-forming shrub. Flowers 0.5 in (1.3 cm) wide; with five white petals. Height: 30 ft (9 m). Diameter: 1 ft (0.3 m).
Moist soils of mountain streams and valleys; with sagebrush and conifers.
Local in southern Alaska and from British Columbia south to central California, east to New Mexico, and north to southern Saskatchewan; also local near Lake Superior; near sea level in north; to 6,000 ft (1,829 m) in south.