Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Rosids: Fabids: Rosales
Flora of North America
Haws: A Guide to Hawthorns of the Southeastern US (Lance, 2014)
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Ron Lance rwl2193_a2
Some of the largest flowers in the genus (to 3 cm diameter), per Weakley's Flora.