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Crataegus punctata is a species of hawthorn known by the common names dotted hawthorn[2][3] or white haw that is native to most of the eastern United States and eastern Canada. While some sources claim it is the state flower of Missouri,[4] the actual legislation does not identify an exact species.[5] Furthermore, the Missouri Department of Conservation asserts the Crataegus mollis was specifically designated as the state flower.[6]

Crataegus punctata
Crataegus punctata flowers 2.jpg
A red-anthered form of this variable species
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Genus: Crataegus
Series: Punctatae
Species: C. punctata
Binomial name
Crataegus punctata

Although many North American hawthorns are polyploid and reproduce by apomixis, this species is apparently diploid and sexual, at least throughout Ontario, Canada.[7] The name white haw refers to its distinctive pale (grey) bark, which is particularly noticeable in the winter landscape. The plant is a bush or small tree to about 7 meters in height and very thorny, particularly on the trunk. The flower has three to five styles and approximately 20 stamens, and the fruit has three to five nutlets. Anther colour varies from deep purple through red to pink to white, and the mature fruit colour can be deep burgundy, scarlet, yellow, or yellow with a red cheek.

See alsoEdit

ReferencesEdit

  1. ^ Phipps, J.B.; Robertson, K.R.; Smith, P.G.; Rohrer, J.R. (1990). "A checklist of the subfamily Maloideae (Rosaceae)". Canadian Journal of Botany. 68 (10): 2209–69. doi:10.1139/b90-288.
  2. ^ "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  3. ^ "Crataegus punctata". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 17 January 2016.
  4. ^ "Missouri State Flower". 50states.com. Retrieved 12 September 2015.
  5. ^ "Section 10-030 State floral emblem". mo.gov. Retrieved 12 September 2015.
  6. ^ anonymous. "Hawthorns". mo.gov. Archived from the original on 15 September 2015. Retrieved 12 September 2015.
  7. ^ Talent, N.; Dickinson, T.A. (2005). "Polyploidy in Crataegus and Mespilus (Rosaceae, Maloideae): evolutionary inferences from flow cytometry of nuclear DNA amounts". Canadian Journal of Botany. 83: 1268–1304. doi:10.1139/b05-088.

External linksEdit

  Media related to Crataegus punctata at Wikimedia Commons

  • Phipps, J.B.; O'Kennon, R.J.; Lance, R.W. (2003). Hawthorns and medlars. Cambridge, U.K.: Royal Horticultural Society. ISBN 0881925918.