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Castlegar Hawthorn: Crataegus castlegarensis -
Oregon Hybrid Hawthorn: Crataegus xcogswellii -
Black Hawthorn, Douglas Hawthorn: Crataegus douglasii (Synonyms: Crataegus columbiana, Crataegus columbiana var. columbiana, Crataegus douglasii var. douglasii) - Big, coarse shrub or small tree up to 12 meters high with rough, scaly, brown bark. Young branches dark red-brown. Thorns 12-25 mm long. Leaves 25-75 mm long, broadly obovate, double-toothed above the base. Flowers usually many in flat-topped corymbs. Flowers about 15 mm wide with short triangular sepals. Petals white and orbicular in shape. Stamens number 10 with pink anthers. Found infrequently in the Puget Trough area.
Huckleberry Hawthorn, Suksdorf's Hawthorn: Crataegus gaylussacia (Synonym: Crataegus douglasii var. suksdorfii, Crataegus suksdorfii) - Small tree or big shrub. Small branches pale grayish brown and thorns stout, 8-12 mm long. Leaves similar to variety douglasii but narrower. Flowers 12-15 mm wide with 15-20 stamens. More common west of the Cascades than black hawthorn.
English Hawthorn-Suksdorf's Hawthorn Hybrid: Crataegus gaylussacia x Crataegus monogyna (Synonym: Crataegus monogyna x Crataegus suksdorfii) -
Midland Hawthorn, Woodland Hawthorn: Crataegus laevigata -
Common Hawthorn, English Hawthorn, One-seeded Hawthorn: Crataegus monogyna (Synonyms: Crataegus laevigata, Crataegus monogyna var. monogyna) -
Washington Thorn: Crataegus phaenopyrum -