Washington Hawthorn Crataegus phaenopyrum (Linnaeus f.) Medicus  Synonyms: Crataegus populifolia.
Varying shaped leaves of a Washington Hawthorn in Massachusetts (10/4/2007). Photo by Tom Palmer. (MBP list)

Spines of Washington Hawthorns are collared near their bases. Photo by Tom Palmer. (MBP list)

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