Ulmus pumila 'Green King'
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| Ulmus pumila |
|---|
| Cultivar |
| 'Green King' |
| Origin |
| USA |
The elm cultivar Ulmus pumila 'Green King' was once believed to have been derived from a crossing of the Siberian Elm Ulmus pumila with the American Red Elm Ulmus rubra. However, it appears the tree originated as a sport of U. pumila in 1939 at the Neosho Nurseries, Neosho, Missouri [1].
The tree is perhaps most notable for its extraordinary rate of growth, claimed to be from 8' (2.5 m) to 11' (3.4 m) per annum, and its resistance to wind and drought. It typically forms a wide base and conical crown [2], not dissimilar to the European Hornbeam Carpinus betulus Pyramidalis. The tree featured in the elm trials [3] conducted by Northern Arizona University at Holbrook, where it was noted that the hybrid (sic) had not been "widely tested for resistance to DED (Dutch elm disease)". Its performance in the trials seems to have been insufficently good or bad to warrant any further comment.
Although the tree remains commercially available in the USA, it is no longer widely planted, having been eclipsed by later developments such as 'Homestead' and disease-resistant cultivars of the American Elm U. americana. Moreover, its planting is prohibited in Nevada and Oregon. The tree does not appear to be in cultivation in Europe or Australasia.
Contents |
[edit] Arboreta etc. accessions
[edit] North America
- Morton Arboretum acc. no. 78-69, (listed simply as Ulmus Green King).
[edit] Nurseries
[edit] North America
[edit] Synonymy
- 'Broadleaf Hybrid': Kammerer, E. L. in Bull. Pop. Inf. Morton Arb. 36 (5): 25, 1961.
- 'Field's New Hybrid Elm': Henry Field Seed & Nursery Co., Shenandoah, Iowa, (who renamed the tree 'Green King' circa 1960).
- Ulmus 'Green King': Morton Arboretum Catalogue, 2006.
[edit] References
[edit] External links
- http://www.ag.ndsu.nodak.edu/aginfo/trees/handbook/th-3-117.pdf Siberian Elm and its derivatives.
