'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 [2].
Pests and diseases
Although reported (in patent) to be resistant to Dutch elm disease, 'Lincoln' has not been widely tested.[3] In trials in Oklahoma, the clone was heavily to severely damaged by the Elm Leaf Beetle Xanthogaleruca luteola.[4]
Cultivation
Commercial propagation has been by either softwood cuttings or budding onto Siberian elm rootstocks. 'Lincoln' is not known to be in cultivation beyond North America. Hardiness: USDA zone 3 (hardy to −25 F).
Synonymy
Ulmus rubra 'Lincoln': in error, various authorities.
Accessions
Not known.
Nurseries
Not known.
References
^ abClegg, S.E., & McFarland, C. P. (1981). United States Patent Application PP05015. US Patent Office. [1]
^Obituary, Samuel E. Clegg Jnr., Herald News, 14 Oct. 2006, Joliet, Illinois.
