Ulmus parvifolia 'Emer II' or 'Emerald Vase' (selling name Allee) 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.^[1][2] It was patented in 1991.^[3]

Allee can reach a height of about 15 m, with a more upright crown shape than its stablemate Athena, its spread approximately 13 m, with arching branches bearing medium green, glossy leaves turning orange to rust red in autumn. [1] The exfoliating, mottled bark has a puzzle-like pattern, and is considered attractive.^[3]

• 
  Leaves
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  Bark
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  Branching

The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the Elm Leaf Beetle Xanthogaleruca luteola.^[4] As with the species overall, damage caused by Japanese Beetle is relatively slight (< 8% defoliation).^[5]

Allee 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 Athena.^[6] The tree is being evaluated in the National Elm Trial coordinated by Colorado State University.^[7] With its more upright form, Allee has been described as a better street tree than the commonly planted lacebark elm 'Drake'.^[8] It has been planted by the north front of Austin Hall, Oregon State University, Corvallis, Oregon.^[1][9] Lines of Allee and Bosque in North Robinson Avenue and North Harvey Avenue, Oklahoma City, flank the Oklahoma City National Memorial.^[10] The tree has been introduced to Australia and Europe,^{[citation needed]} and was marketed briefly in England by the Thornhayes Nursery, Devon.

North America

• Bartlett Tree Experts, North Carolina, US. Acc. no. 2001-166
• Boone County Arboretum, Union, Kentucky, US. Accession number BT001113, planted 2009.^[11]
• Brenton Arboretum, Dallas Center, Iowa, US. One tree, acquired 2009. Acc. no. not known.
• Harry P. Leu Gardens, Orlando, Florida.^[12] No accession details available.
• Holden Arboretum, US. Acc. no. 98-26
• Scott Arboretum, US. Acc. no. 2000-006
• Smith College, US. Acc. nos 302, 33603
• U S National Arboretum [2]^{[permanent dead link‍]}, Washington, D.C., US. Acc. no. 64442
• University of Idaho arboretum, US. One tree. Acc. no. 1998010

North America

(Widely available)

Australasia

• Fleming's Nursery [3], Monbulk, Victoria, Australia.

• http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/ulmus_parvifolia.htm^{[permanent dead link‍]} Ulmus parvifolia cultivar list.
• https://web.archive.org/web/20030413074605/http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Return of the Elm - the status of elms in the nursery industry in 2000. Warren, K., J. Frank Schmidt and Co.