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: Morphology suggests hybrid origin of a form of C. collina with perhaps C. margaretiae or C. mollis; 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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