The Genus Crataegus

Douglas Hawthorn, Black Hawthorn: Crataegus douglasii (Synonyms: 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.

One-seeded Hawthorn, Common Hawthorn, English Hawthorn: Crataegus monogyna (Synonym: Crataegus laevigata) -

Hybrid Hawthorn: Crataegus monogyna x suksdorfii -

Suksdorf's Hawthorn: Crataegus suksdorfii (Synonym: Crataegus douglasii var. 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.