Crataegus Linnaeus. Subfamily: Amygdaloideae. Tribe: Maleae. Subtribe: Malinae. Common name: Hawthorn, Haw, Thornapple.
Contributed by Ron Lance
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.
References: 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); Witsell & Lance (2024). Show full citations.
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.
© Keith Bradley | Crataegus macrosperma | Original Image ⭷
© Bruce A. Sorrie | Crataegus aprica | Original Image ⭷
© Keith Bradley | Crataegus spathulata | Original Image ⭷
© Gary P. Fleming | Crataegus marshallii | Original Image ⭷
© Bruce A. Sorrie | Crataegus uniflora | Original Image ⭷
© Gary P. Fleming | Crataegus marshallii | Original Image ⭷
© Keith Bradley | Crataegus marshallii | Original Image ⭷
© Aidan Campos | Crataegus viridis var. glabriuscula source | Original Image ⭷
© Ron Lance | Crataegus lancei | Original Image ⭷Feedback
See something missing or incorrect about Crataegus? Let us know here:
- Please include your name and if possible, email in case when need to clarify what you wrote.
- If you opt out of including email, please be as specific as possible (e.g., which photo is incorrect?)
- Please do not submit questions asking to identify plants or about horticultural topics (e.g., how do I control an invasive plant in my garden?). Instead, those questions can be submitted here for the Carolinas region only.
- Please do not send us feedback about unkeyed species as this work is ongoing.
- Please allow time for flora edits to show in our next data release. We greatly appreciate your feedback but may require extra time to research complicated taxonomic issues.