Crataegus Linnaeus. Subfamily: Amygdaloideae. Tribe: Maleae. Subtribe: Malinae. Hawthorn, Haw, Thornapple.

Contributed by Ron Lance

Key to Crataegus

A genus of 100-500 species, shrubs and small trees, north temperate and Central America, most in e. North America.

ID notes:All references to leaves and petioles pertain to foliage on short shoots (floreal shoots, or spur shoots), unless otherwise specified. The term "terminal shoots" refers to elongating vegetative twigs, typically at the terminus of branches.

Ref: Ashe (1900a); Ashe (1900b); Ashe (1900c); Ashe (1901); Ashe (1903a); Ashe (1903b); Ashe (1916); Beadle (1913) In Small (1913a); Chapman (1892); Chen et al. (2020); Deam (1940); Eggleston (1913) In Britton & Brown (1913); Eriksson et al. (2003); Eugenia, Stefanovič, & Dickinson (2007); Gilman & Haines (2022); Harper (1928); Kalkman In Kubitzki et al. (2004); Kalkman In Kubitzki et al. (2004); Kruschke (1955); Kruschke (1965); Lance (1995); Lance (2011); Lance (2013); Lance (2014); Lance & Phipps (2000); Palmer (1924); Palmer (1925); Palmer (1926); Palmer (1935); Palmer (1956); Palmer (1960) In Vines (1960); Palmer (1969) In Braun (1969); Phipps (1988a); Phipps (1988b); Phipps (1990); Phipps (1998); Phipps (2006); Phipps (2007); Phipps (2012); Phipps (2014d) In Flora of North America Editorial Committee (2014); Phipps (2014d) In Flora of North America Editorial Committee (2014); Phipps (2014e) In Flora of North America Editorial Committee (2014); Phipps (2016); Phipps & Dvorsky (2006); Phipps & Dvorsky (2007); Phipps & Dvorsky (2008); Phipps & O'Kennon (1997); Phipps, Lance, & Dvorsky (2006); Phipps, O'Kennon, & Dvorsky (2006); Phipps, O’Kennon, & Lance (2003); Phipps, Yatskievych, & Wood (2007); Poindexter & Lance (2011); Potter et al. (2007); Sargent (1903); Sargent (1908b); Sargent (1911a); Sargent (1913); Sargent (1920); Sargent (1921a); Sargent (1921b); Sargent (1922a); Tucker (1976). Show full citations.

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