Crataegus monogyna
Common name: 
Singleseed Hawthorn
Common Hawthorn
English Hawthorn
kra-TEE-gus mon-o-JI-na
Native to (or naturalized in) Oregon: 
  • 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.  There were several on the Oregon State Univ. camp, some possibly were rootstocks for scion types that died; all have since been removed..
  • 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.
  • Invasive: Can be invasive since it is a prolific seed producer and can form dense thickets which exclude all understory plants.  The Oregon Department of Agriculture lists C. monogyna as a potential “B” noxious weed.  It very clearly degrades wildlife habitat in oak woodlands in our region forming very dense stands. It is also a nuisance in parks, fencerows, and fields.  C. monogyna can hybridize with native hawthorn species such as the black hawthorn (C. douglasii) found in the west (Randall and Marinelli, 1996).
  • Crataegus monogyna is naturalized in North America but is not common in American gardens; a few cultivars exist including a contorted version, Flexuosa.
  • Oregon State Univ. campus: south side Ocean Admin. Building
Click image to enlarge
  • plant habit, spring flowering

    plant habit, spring flowering

  • leaves and flowers

    leaves and flowers

  • 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