Ulmus × androssowii 'Recerta'

Ulmus 'Recerta' is an American hybrid cultivar raised by the Wisconsin Alumni Research Foundation (WARF) as selection '196-5' from seed obtained from a Siberian Elm Ulmus pumila in Volgograd, Russia; the male parent deduced as the Field Elm Ulmus minor.^[1][2]

'Ulmus 'Recerta'
'Recerta' at Amerbos, Amsterdam.
Genus	Ulmus
Hybrid parentage	U. pumila × U. minor
Cultivar	'Recerta'
Origin	US

Description

'Recerta' produces a straight, clean stem, supporting a rounded crown. The leaves are elliptic, with typically acuminate tip, the blade 6–12 cm long by 3–6.5 cm broad; the margins are doubly, if bluntly, serrate.^[3]

• 
  Leaves
• 
  Bark

Pests and diseases

Tests in the USA found the cultivar to be only "somewhat resistant to Dutch elm disease",^[4] meanwhile evaluation in France by the Institut National de la Recherche Agronomique (INRA) confirmed the tree as only "moderately resistant".^[5]

Cultivation

Serious doubts as to the tree's long term culture in Europe have been expressed.^[6] Although registered in 1993 as 'Recerta' by Conrad Appel KG (ceased trading 2006), of Darmstadt, Germany, the tree is not known to have ever been in commerce.

Notable trees

A mature specimen grows in a park in the Amerbos district of north Amsterdam, planted in the early 1990s along with other elm cultivars.