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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.

Key advice: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. Fruiting specimens are helpful, and necessary for at least some parts of Key C.

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. (2020a); 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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Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Keith Bradley | Crataegus macrosperma | Original Image ⭷
image of plant© Bruce A. Sorrie | Crataegus aprica | Original Image ⭷
image of plant© Keith Bradley | Crataegus spathulata | Original Image ⭷
image of plant© Gary P. Fleming | Crataegus marshallii | Original Image ⭷
image of plant© Bruce A. Sorrie | Crataegus uniflora | Original Image ⭷
image of plant© Gary P. Fleming | Crataegus marshallii | Original Image ⭷
image of plant© Keith Bradley | Crataegus marshallii | Original Image ⭷
image of plant© Aidan Campos | Crataegus viridis var. glabriuscula source | Original Image ⭷
image of plant© Ron Lance | Crataegus lancei | Original Image ⭷

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