| Ulmus 'Rebona' | |
| Hybrid: | U. davidiana var. japonica × U. pumila |
| Genus: | Ulmus |
| Cultivar: | 'Rebona' |
| Origin: | US |
Ulmus 'Rebona' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection 'W916', derived from a crossing of Japanese Elm clone W43-8 = 'Reseda' with Siberian Elm clone W426 grown from seed collected from a street tree at Yankton, South Dakota.[1] The tree was registered in 1993 by Conrad Appel KG, of Darmstadt (ceased trading 2006) and is a sibling of 'New Horizon' (selection 'W917'). In Europe, 'Rebona' is marketed as a Resista elm[2] protected under E U breeders' rights (E U council decision 2100/94).
'Rebona' bears a close resemblance to its sibling 'New Horizon', but requires less maintenance owing to a better leader. The tree grows rapidly,[3] developing a fastigiate pyramidal shape with ascending branches. The glossy leaves (6 to 9 cm long by 3 to 5 wide) are described by Resista Ulmen as "a little smaller and darker" than those of 'New Horizon'.[3] [4] The petiole is 10 to 15 mm long.[5] [6]
'Rebona' is highly resistant to Dutch elm disease, rated 5 out of 5.[4]
'Rebona' has been widely planted as a street tree in Germany, the Netherlands, and to a lesser extent in France and the UK.[7]