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Populus × acuminata or Populus acuminata, the lanceleaf cottonwood, is a species of Populus native to the Rocky Mountains of North America. It is a naturally occurring hybrid of narrowleaf cottonwood, Populus angustifolia, and eastern cottonwood, Populus deltoides, found where their ranges overlap. It is planted as a shade tree in cities in the Rockies, preferring to grow at elevations between 4,500 and 8,500 ft.cite-ref-3[3]cite-ref-4[4] Given the plant's proclivity (like other poplars) to send out shallow roots and suckers, some municipalities prohibit their planting. Fort Collins, Colorado, by contrast, has many lanceleaf cottonwoods gracing its avenues.cite-ref-5[5]

cite-note-11. Bull. Torrey Bot. Club 20:50. 1893

cite-note-22. "Populus × acuminata Rydb". Tropicos.org. Missouri Botanical Garden. 24 January 2020. Retrieved 24 January 2020.

cite-note-33. ↑ citerefbarrett1999Barrett, Ann (1999). High altitude planting: A practical guide to landscaping, gardening, and planting above 6,000 feet. p. 39. ISBN 9780967333106.

cite-note-44. ↑ citerefmorrow2016Morrow, Baker H. (2016-04-15). Best Plants for New Mexico Gardens and Landscapes: Keyed to Cities and Regions in New Mexico and Adjacent Areas. Revised and Expanded Edition. p. 39. ISBN 9780826356376.

cite-note-55. ↑ citerefcain2007Cain, Kathleen (2007). The Cottonwood Tree: An American Champion. pp. 31–34. ISBN 9781555663704.