Ulmus crassifolia

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Ulmus crassifolia
Ulmus crassifolia leaves.jpeg
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Ulmaceae
Genus: Ulmus
Species: U. crassifolia
Binomial name
Ulmus crassifolia
Nutt.
Ulmus crassifolia range map 4.png
Natural range (Florida population excluded)
Synonyms
  • Ulmus monterreyensis Mull.
  • Ulmus opaca Nutt.

Ulmus crassifolia Nutt., the Texas Cedar Elm or simply Cedar Elm, is a deciduous tree native to south central North America, mainly in southern and eastern Texas, eastern Oklahoma, Arkansas and Louisiana, with small populations in western Mississippi, southwest Tennessee and northwestern Florida;[1] it also occurs in northeastern Mexico.[2][3] The tree typically grows well in flat valley bottom areas referred to as 'Cedar Elm Flats'.

Description[edit]

The Cedar Elm is a medium-sized to large deciduous tree growing to 24 – 27 m tall with a rounded crown. The leaves are small, 2.5 – 5 cm long by 1.3 – 2 cm broad, with an oblique base, and distinguish it from Ulmus serotina with which it readily hybridizes in the wild. Leaf fall is late in the year, often in early winter. The wind-pollinated apetalous perfect flowers are produced in the late summer or early fall; they are small and inconspicuous, with a reddish-purple color. The fruit is a small winged samara 8 – 10 mm long, maturing quickly after the flowering in late fall.[4][5]

Ulmus crassifolia bark

Pests and diseases[edit]

Cedar Elm is susceptible to Dutch elm disease (DED), though not to the extent that American Elm is, and moderately damaged by the Elm Leaf Beetle Xanthogaleruca luteola. The tree also suffers from a vascular wilt, the symptoms often confused with those of DED, whilst in Texas it is damaged by Spanish moss Tillandsia usneoides, which drapes across the branches weakening the tree, occasionally killing it.[6][7]

Cedar elms are very susceptible to mistletoe. Mistletoe is a parasite that roots itself in to the vascular system of the tree, thus stealing valuable nutrients and water. In some cases, if not removed the parasite can be devastating to large sections of trees and even fatal. They create club like branches that die out at the ends. These "club" branches create openings for future pests like the elm beetles and carpenter ants. There are no known treatments that are safe enough to kill mistletoe without killing the tree. Removing the mistletoe manually is not a guarantee, however it is the best known method for control.[citation needed]

Cultivation[edit]

Owing to Dutch elm disease, the Cedar Elm is now rarely cultivated in North America. It is extremely rare in cultivation in Europe,[8] and Australasia.[9]

Cultivars[edit]

Hybrids[edit]

Accessions[edit]

North America[edit]

Europe[edit]

Australasia[edit]

Nurseries[edit]

North America[edit]

Widely available

Europe[edit]

Australasia[edit]

None known.

References[edit]

  1. ^ "Map: Ulmus crassifolia". Efloras.org. Retrieved 2013-09-01. 
  2. ^ Todzia, C. A. & Panero, J. L. (2006). A new species of Ulmus (Ulmaceae) from southern Mexico and a synopsis of the species in Mexico. Brittonia, Vol 50, (3): 346
  3. ^ "A New Species of Ulmus (Ulmaceae) from Southern Mexico and a Synopsis of the Species in Mexico". Jstor.org. Retrieved 2013-11-30. 
  4. ^ "Ulmus crassifolia in Flora of North America @". Efloras.org. Retrieved 2013-09-01. 
  5. ^ "Plants Profile for Ulmus crassifolia (cedar elm)". Plants.usda.gov. Retrieved 2013-09-01. 
  6. ^ "Ulmus crassifolia Nutt". Na.fs.fed.us. Retrieved 2013-09-01. 
  7. ^ [1][dead link]
  8. ^ Elwes, H. J. & Henry, A. (1913). The Trees of Great Britain & Ireland. Vol. VII. pp 1848-1929. Private publication. [2]
  9. ^ Auckland Botanical Society (2003). Journal Vol. 58 (1), June 2003. ISSN 0113-41332
  10. ^ "''Ulmus crassifolia'' at Morton Arboretum". Cirrusimage.com. 2010-05-06. Retrieved 2013-09-14. 
  11. ^ Ramon Jordan. "US National Arboretum :". Usna.usda.gov. Retrieved 2013-09-01. 
  12. ^ "English". Arboretum-waasland.be. Retrieved 2013-09-01.