Ulmus 'Lincoln'

Ulmus hybrid
Hybrid parentage U. rubra × U. pumila
Cultivar 'Lincoln'
Origin USA

The American hybrid cultivar Ulmus 'Lincoln' was selected from crossings of the Slippery, or Red, Elm Ulmus rubra (female parent) and the Siberian Elm Ulmus pumila made in Aurora, Illinois circa 1958 and patented in 1983.[1]

Description

'Lincoln' is parabolic in shape, with excurrent branching; the bark is slightly fissured, and dark grey-green in colour. The branches are slender and smooth, with moderately abundant lenticels; the branching angle at the axis approximately 55°. The leaves are cordante-acuminate, about 9 cm long by 5 cm wide, with doubly-serrate margins, the slightly scabrous upper surfaces a lustrous dark green, turning yellow in the fall.[1] The foliage is retained well into autumn .

Pests and diseases

Although reported (in patent) to be resistant to Dutch elm disease, it has not been widely tested.[2] In trials in Oklahoma, the clone was heavily to severely damaged by the Elm Leaf Beetle Xanthogaleruca luteola .

Cultivation

Commercial propagation has been by either by softwood cuttings, or budding onto a Siberian Elm Ulmus pumila rootstock. 'Lincoln' is not known to be in cultivation beyond North America. Hardiness: USDA zone 3 (hardy to -25 F.)

Synonymy

Accessions

Not known.

Nurseries

None known.

References

  1. ↑ 1.0 1.1 Clegg, S.E., & McFarland, C. P. (1981). United States Patent Application PP05015. US Patent Office.
  2. ↑ Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.