Ulmus parvifolia 'Emer II or Emerald Vase (selling name ) is a Chinese elm cultivar selected by Dr. Michael A. Dirr and cloned in the late 1980s from a tree planted circa 1910 on the University of Georgia campus at Athens, that had survived ice-storms undamaged. It was patented in 1991.
can reach a height of about 15 m, with a more upright crown shape than its stablemate , its spread approximately 13 m, with arching branches bearing medium green, glossy leaves turning orange to rust red in autumn. https://web.archive.org/web/20110608075433/http://www.ncsu.edu/jcraulstonarboretum/photography/raulston_slides/raulston_slides_results.php?fullsearch=&box=&slide=&date=&photographer=&country=&usstate=&city=&location=campus&keywords=&othernotes=&plantnames=&commonnames=&families=&digitized=&plantnameID= The exfoliating, mottled bark has a puzzle-like pattern, and is considered attractive.
The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the elm leaf beetle Xanthogaleruca luteola. As with the species overall, damage caused by Japanese beetle is relatively slight (< 8% defoliation).
is reputedly drought tolerant, but in the elm trials conducted by Northern Arizona University at Holbrook, Arizona, it proved unsuited to the hot, arid climate and sustained over 50% mortality in its first year, as did its sibling . The tree is being evaluated in the National Elm Trial coordinated by Colorado State University. With its more upright form, has been described as a better street tree than the commonly planted lacebark elm 'Drake'. It has been planted by the north front of Austin Hall, Oregon State University, Corvallis, Oregon. Lines of and in North Robinson Avenue and North Harvey Avenue, Oklahoma City, flank the Oklahoma City National Memorial. The tree has been introduced to Australia and Europe, and was marketed briefly in England by the Thornhayes Nursery, Devon.
(Widely available)