– firethorn, scarlet firethorn
Distribution: Occurring in scattered locations across Washington; British Columbia south to California, east to the Atlantic Coast along the southern half of the U.S.
Habitat: Disturbed areas, wastelots, and forest margins often near towns and cities where escaped from cultivation.
Origin: Introduced from southern Europe
– Chinese firethorn
Distribution: Occurring in lowland western Washington; British Columbia to California, also Texas to North Carolina.
Habitat: Disturbed, open areas where escaped from cultivation through bird-dispersal.