Ulmus americana 'Lewis & Clark'

rdf:langString Ulmus americana 'Lewis & Clark'

rdf:langString Ulmus americana 'Lewis & Clark' =

rdf:langString Ulmus americana 'Lewis & Clark' =

rdf:langString 'Lewis & Clark'

rdf:langString 'Lewis & Clark', Boarhunt, UK, age 20 yrs

rdf:langString North Dakota State University Research Foundation, US

rdf:langString Ulmus americana

rdf:langString The American elm cultivar Ulmus americana 'Lewis & Clark' (trade name Prairie Expedition) is a development from the North Dakota State University (NDSU) Research Foundation breeding programme, released in 2004 to commemorate the 200th anniversary of the eponymous expedition. The cultivar was cloned from a tree discovered in 1994 along the Wild Rice River south west of Fargo, North Dakota, where all those around it had succumbed to Dutch elm disease; the tree remains in perfect health (2008). Prairie Expedition proved only moderately successful in the US National Elm Trial, averaging a survival rate of 62.6% overall, potentially due to environmental factors rather than susceptibility to Dutch elm disease. Prairie Expedition was introduced to the UK in 2008 by Hampshire & Isle of Wight Branch, Butterfly Conservation, as part of an assessment of DED-resistant cultivars as potential hosts of the endangered White-letter Hairstreak.