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Crataegus ×lettermanii Sargent. Letterman's Hawthorn. Phen: Apr; Sep-Oct. Hab: Mesic woodlands, scrubland, pastures. Dist: Endemic of s. MO.

Origin/Endemic status: Endemic

Taxonomy Comments: The morphology suggests hybrid origin of a form of C. collina with perhaps C. margaretiae; alternatively promoted as a variety of C. collina by Eggleston (1908) and Phipps (FNA9).

Synonymy: = Lance (2014); = Crataegus collina Chapm. var. lettermanii – FNA9, G; = Crataegus lettermani – F

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