The elm cultivar Ulmus 'Myrtifolia' was identified by Nicholson in Kew Hand-List Trees & Shrubs 2: 135, 1896 but without description. It was later listed as a cultivar by Rehder

Alfred Rehder

Alfred Rehder was a horticulturist and taxonomist who worked at the Arnold Arboretum of Harvard University. Rehder was a newspaper writer from Germany who was originally hired as a laborer at the Arnold Arboretum. His talents for horticultural plant taxonomy were soon recognized, however...

 in Jour. Arnold Arb. 20: 87 1939, and by Krüssmann in Handb. Laubgeh. 2: 540, 1962.

Description

'Myrtifolia' was described as having leaves ovate or rhombic-ovate to oblong-ovate, 2 to 5 cm long with nearly simple teeth, loosely pilose on both sides. The specimen under this name in the Herb. Nicholson at Kew

Kew

Kew is a place in the London Borough of Richmond upon Thames in South West London. Kew is best known for being the location of the Royal Botanic Gardens, now a World Heritage Site, which includes Kew Palace...

 was considered by Melville

Ronald Melville

Ronald Melville was an English botanist, based at the Royal Botanic Gardens Kew. He is chiefly remembered for his wartime research into rosehips as a source of vitamin C, prompted by the epidemic of scurvy amongst children owing to the reduced importation of fresh fruit...

 to be probably either Ulmus carpinifolia (: minor) × plotii or Ulmus × hollandica .

Synonymy

• Ulmus campestris (: minor) var. myrtifolia Hort.: Nicholson, in Kew Hand-List Trees & Shrubs 2: 135, 1896.
• Ulmus buxifolia Hort.: Nicholson, Kew Hand-List Trees & Shrubs 2: 135, 1896, in synonymy.