The

hybrid Hybrid may refer to: Science * Hybrid (biology), an offspring resulting from cross-breeding ** Hybrid grape, grape varieties produced by cross-breeding two ''Vitis'' species ** Hybridity, the property of a hybrid plant which is a union of two dif ...

elm cultivar ''Ulmus × intermedia'' 'Rosehill' is an American hybrid cultivar originally raised by the Rose Hill Nurseries of

Kansas City The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri (9 counties) and Kansas (5 counties). With and a population of more ...

, Missouri, as ''Ulmus'' 'Rose Hill', without species names, from a selection of '' Ulmus pumila'' (female parent) × ''

Ulmus rubra ''Ulmus rubra'', the slippery elm, is a species of elm native to eastern North America. Other common names include red elm, gray elm, soft elm, moose elm, and Indian elm. Description ''Ulmus rubra'' is a medium-sized deciduous tree with a sprea ...

'' seedlings made in 1951.

Description

'Rosehill' was described as slightly slower growing than its sibling 'Willis', but carrying a heavier crown, with good branching and attractive foliage.www.ulmen-handbuch.de Herbarium specimens show leaves 2 to 3 in. long and 1 to 2 in. wide, and the seed central in a rounded

samara Samara ( rus, Сама́ра, p=sɐˈmarə), known from 1935 to 1991 as Kuybyshev (; ), is the largest city and administrative centre of Samara Oblast. The city is located at the confluence of the Volga and the Samara (Volga), Samara rivers, with ...

, with an open circular notch at the apex.

Pests and diseases

In 1995 Santamour reported the cultivar "not widely tested for resistance to Dutch elm disease". Elowsky, Jordon-Thaden, and Kaul (2013) refer to more recent papers on the subject.

Cultivation

The tree was later marketed by the Willis Nursery Co. of

Ottawa Ottawa (, ; Canadian French: ) is the capital city of Canada. It is located at the confluence of the Ottawa River and the Rideau River in the southern portion of the province of Ontario. Ottawa borders Gatineau, Quebec, and forms the core ...

, Kansas. It is not known whether 'Rosehill' remains in cultivation, or if it was ever introduced to Europe or Australasia.

Notable trees

A well-grown tree labelled 'Rosehill', sourced from the Willis Nursery of Kansas and planted in 1960,Harvard University Herbaria, specimen 00170038: Arnold Arboretum ''U. pumila'' × ''U. rubra'' 'Rose Hill' (1985), superseding label ''Ulmus'' 'Rosehill' (1984); summer leavesHarvard University Herbaria, herbarium specimen 00170039: Arnold Arboretum ''U. pumila'' × ''U. rubra'' 'Rose Hill' (1985), superseding label ''Ulmus'' 'Rosehill' (1984); samarae & new leaves stands in

Arnold Arboretum The Arnold Arboretum of Harvard University is a botanical research institution and free public park, located in the Jamaica Plain and Roslindale neighborhoods of Boston, Massachusetts. Established in 1872, it is the oldest public arboretum in N ...

, Massachusetts. The arboretum's herbarium specimen (00170039), labelled simply ''Ulmus'' 'Rosehill' in 1984, was changed in 1985 to ''U. pumila'' × ''U. rubra'' 'Rose Hill'. A photograph shows leaves with only about eight vein pairs, fewer than known examples of ''Ulmus'' × '' intermedia'', calling into question the identification of 'Rosehill' as a hybrid of this group. The herbarium specimen, however, shows leaves with on average about 12 vein pairs, more typical of this hybrid group.

Synonymy

*'Boulevard': Rosehill Gardens, Kansas, Missouri; Spring catalog 1960.

Accessions

North America

, US.; acc. no. 748-60.

References

{{DEFAULTSORT:Ulmus x intermedia 'Rosehill' Ulmus × intermedia cultivar Ulmus articles missing images Ulmus