Taxon:  Cupressus ×leylandii A. B. Jacks. & Dallim.



Summary
Genus:
Cupressus
Family:
Cupressaceae
Nomen number:
404809
Place of publication:
Bull. Misc. Inform. Kew 1926:114, t. 7, fig.  1926
Hybrid parentage:
= Cupressus macrocarpa × C. nootkatensis
Verified:
05/13/2012 ARS Systematic Botanists.
Accessions:
18 (15  active, 0  available) in National Plant Germplasm System.  (Map it)
Other conspecific taxa
Autonyms (not in current use), synonyms and invalid designations
Homotypic Synonym(s)
Callitropsis ×leylandii (A. B. Jacks. & Dallim.) D. P. Little
×Cupressocyparis leylandii (A. B. Jacks. & Dallim.) Dallim.
×Cuprocyparis leylandii (A. B. Jacks. & Dallim.) Farjon
×Hesperotropsis leylandii (A. B. Jacks. & Dallim.) Garland & Gerry Moore

No images


Conservation Status

Reference(s)
  1. Cariñanos, P. & F. Marinangeli. 2021. An updated proposal of the potential allergenicity of 150 ornamental trees and shrubs in Mediterranean cities. Urban Forest. & Urban Green. 63:127218. DOI: 10.1016/j.ufug.2021.127218. Note: very high allergenicity as "Cupressocyparis leylandii"
  2. Farjon, A. et al. 2002. A new genus and species in Cupressaceae (Coniferales) from northern Vietnam, Xanthocyparis vietnamensis. Novon 12:188. Note: = ×Cuprocyparis leylandii (A. B. Jacks. & Dallim.) Farjon
  3. Little, D. P. 2006. Evolution and circumscription of the true cypresses (Cupressaceae: Cupressus). Syst. Bot. 31:474. Note: = Callitropsis ×leylandii (A. B. Jacks. & Dallim.) D. P. Little
  4. Loasby, I. 2008. National diploma forestry and arboriculture. Unit 24 abroriculture - tree identification, planting and care. Note: as × Cuprocyparis leylandii
Common names
LanguageNameAlternate namenoteseqCitation
EnglishLeyland cypress as ×Cupressocyparis leylandii1Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening Note: = ×Cupressocyparis leylandii
Swedishleylandcypress  2Aldén, B., S. Ryman, & M. Hjertson. 2012. Svensk Kulturväxtdatabas, SKUD (Swedish Cultivated and Utility Plants Database; online resource)
Distribution
order_codeStatusContinentSubcontinentCountryStateNotecitation_id
2Cultivated    only cult.0
Cultivated (only cult.)

Economic Uses
UsageTypeNoteReference
Environmentalornamentalas Cupressocyparis leylandiiHuxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening Note: as ×Cupressocyparis leylandii
Environmentalornamentalas Cupressocyparis leylandiiWalters, S. M. et al., eds. 1986-2000. European garden flora. Note: as ×Cupressocyparis leylandii
Socialreligious/secularused as a Christmas treeLoasby, I. 2008. National diploma forestry and arboriculture. Unit 24 abroriculture - tree identification, planting and care. Note: as × Cuprocyparis leylandii
Vertebrate poisonsmammalsas Cupressocyparis leylandiiCooper, M. R. & A. W. Johnson. 1998. Poisonous plants and fungi in Britain: animal and human poisoning Note: as ×Cupressocyparis leylandii
Vertebrate poisonsmammalsto humans, source of allergenic airborne pollen as Cupressocyparis leylandiiCariñanos, P. & F. Marinangeli. 2021. An updated proposal of the potential allergenicity of 150 ornamental trees and shrubs in Mediterranean cities. Urban Forest. & Urban Green. 63:127218. DOI: 10.1016/j.ufug.2021.127218. Note: very high allergenicity as "Cupressocyparis leylandii"
Cite as: USDA, Agricultural Research Service, National Plant Germplasm System. 2026. Germplasm Resources Information Network (GRIN Taxonomy). National Germplasm Resources Laboratory, Beltsville, Maryland.
URL: https://npgstest.ars-grin.gov/gringlobal/taxon/taxonomydetail?id=404809. Accessed 15 April 2026.