Crataegus monogyna
Common name: 
Singleseed Hawthorn
Common Hawthorn
English Hawthorn
Pronunciation: 
kra-TEE-gus mon-o-JI-na
Family: 
Rosaceae
Genus: 
Crataegus
Type: 
Broadleaf
Native to (or naturalized in) Oregon: 
Yes
  • Deciduous tree, 20-30 ft (6-9 m); dense, rounded headed.  Thrones to 2.5 cm. Leaves alternate, simple, 2-6.5 cm long, 3-7 lobed, deeply incised, glossy green.  Flowers white, 8-15 mm wide, with a single style (single ovary or stone, hence monogyna , i.e., with one pistil, the female element of a flower), in clusters (umbelate).  Fruit oblong, 1 cm diam., red, with a single stone (seed).
  • Sun, resistant to many diseases of Crataegus, e.g. rust.  The many on the Oregon State Univ. campus possibly were rootstocks for scion types that died.
  • Hardy to USDA Zone 4    Native to Europe, northern Africa, western Asia.  Common in the English countryside as a roadside hedge.    A very similar appearing species, but much rarer commerce, is C. ambigua, Russian Hawthorn.
  • Crataegus monogyna is naturalized in North America but is not common in American gardens; a few cultivars exist including a contorted version, Flexuosa.
  • Can be invasive since it is a prolific seed producer and can form dense thickets which exclude all understory plants.  It can hybridize with native hawthorn species such as the black hawthorn (C. douglasii) found in the west (Randall and Marinelli, 1996).
  • Oregon State Univ. campus: south side Ocean Admin. Building.
Click image to enlarge
  • plant habit, flowering

    plant habit, flowering

  • leaves and flowers

    leaves and flowers

  • leaves

    leaves

  • flower clusters

    flower clusters

  • fruit and leaves

    fruit and leaves

  • fruit, leaves and seed

    fruit, leaves and seed

  • fruit, seed and buds, winter

    fruit, seed and buds, winter