Crataegus ser. Tenuifoliae

Series Tenuifoliae is a series within the genus Crataegus that contains at least seven species of hawthorn trees and shrubs, native to Eastern North America, with one disjunct species (C. wootoniana) in the mountains of New Mexico.

Species
The principal species in the series are: The following rare local species appear to be hybrid derivatives of series Tenuifoliae:
 * Crataegus flabellata
 * Crataegus schuettei
 * Crataegus roribacca
 * Crataegus fluviatilis
 * Crataegus iracunda
 * Crataegus macrosperma
 * Crataegus wootoniana
 * Crataegus × fretalis
 * Crataegus × lucorum