The elm cultivar Ulmus 'Ramulosa' [: 'twiggy'], Floetbeck elm,[1][2] was raised in the Floetbeck (or Flottbeck) nurseries, Hamburg, by James Booth & Son[3] (a principal supplier of continental elms to the UK, considered by Loudon the finest nursery in Germany[4]), and was first mentioned by Loudon in Arboretum et Fruticetum Britannicum (1838) as Ulmus montana glabra var.
ramulosa Booth, but without description.
[5] It does not, however, appear in Booth's 1838 list.
[3] Loudon listed the tree in a group including Downton Elm, Scampston Elm, and Ludlow Elm,[6] so Green's wych cultivar attribution (Ulmus glabra Huds.)
Loudon mentions that there were specimens present in the original Horticultural Society Garden, London.