Betula occidentalis

Taxonavigation

Taxonavigation: Fagales
Classification System: APG IV Superregnum: Eukaryota Regnum: Plantae Cladus: Angiosperms Cladus: Eudicots Cladus: Core eudicots Cladus: Rosids Cladus: Eurosids I Ordo: Fagales

Betula occidentalis Hook., Fl. Bor.-Amer. 2: 155 (1838).

Homotypic
- Betula alba subsp. occidentalis (Hook.) Regel, Bull. Soc. Imp. Naturalistes Moscou 38(2): 400 (1865).
- Betula papyracea var. occidentalis (Hook.) Dippel, Handb. Laubholzk. 2: 177 (1891).
- Betula alba f. occidentalis (Hook.) Fernald, Amer. J. Sci., ser. 4, 14: 173 (1902).
- Betula microphylla var. occidentalis (Hook.) M.E.Jones, Contr. W. Bot. 12: 77 (1908).
- Betula papyrifera var. occidentalis (Hook.) Sarg., J. Arnold Arbor. 1: 63 (1919).
- Betula papyrifera subsp. occidentalis (Hook.) Hultén, Acta Univ. Lund., 2, 40(1): 582 (1944).
Heterotypic
- Betula fontinalis Sarg., Bot. Gaz. 31: 239 (1901).
- Betula microphylla var. fontinalis (Sarg.) M.E.Jones, Contr. W. Bot. 12: 77 (1908).
- Betula elrodiana E.J.Butler, Bull. Torrey Bot. Club 36: 426 (1909).
- Betula fontinalis f. inopina Jeps., Fl. Calif. 1: 349 (1909).
- Betula occidentalis f. inopina Jeps., Fl. Calif. 1: 349 (1909).
- Betula fontinalis var. inopina (Jeps.) Jeps., Man. Fl. Pl. Calif.: 270 (1923).
- Betula beeniana A.Nelson, Amer. J. Bot. 32: 284 (1945).
- Betula occidentalis var. inopina (Jeps.) C.L.Hitchc., Vasc. Pl. Pacif. N. W. 2: 78 (1964).
- Betula occidentalis subsp. inopina (Jeps.) A.E.Murray, Kalmia 13: 3 (1983).

Native distribution areas:

Northern America
- Eastern Canada
  - Ontario.
- North-Central U.S.A.
  - Nebraska, North Dakota, South Dakota.
- Northwestern U.S.A.
  - Colorado, Idaho, Montana, Oregon, Washington, Wyoming.
- South-Central U.S.A.
  - New Mexico.
- Southwestern U.S.A.
  - Arizona, California, Nevada, Utah.
- Subarctic America
  - Alaska, Northwest Territories, Yukon.
- Western Canada
  - Alberta, British Columbia, Manitoba, Saskatchewan.

Ashburner, K. & McAllister, H.A. 2013. The genus Betula: A taxonomic revision of birches (A Botanical Magazine Monograph). Royal Botanic Gardens, Kew, 431 pp., ISBN 978-1-84246-141-9. Reference page.
Stritch, L., 2014. Betula occidentalis. The IUCN Red List of Threatened Species 2014. IUCN Red List Category: (Least Concern). DOI: 10.2305/IUCN.UK.2014-3.RLTS.T194643A2355167.en. Reference page.
Wang. N., McAllister, H.A., Bartlett, P.R. & Buggs, R.J.A. 2016. Molecular phylogeny and genome size evolution of the genus Betula (Betulaceae). Annals of Botany 117(6): 1023–1035. DOI: 10.1093/aob/mcw048 Reference page.

Govaerts, R. et al. 2025. Betula occidentalis in Kew Science Plants of the World Online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2025 Jul 20. Reference page.
International Plant Names Index. 2025. Betula occidentalis. Published online. Accessed: 20 Jul 2025. Reference page.
Hassler, M. 2025. World Plants. Synonymic Checklist and Distribution of the World Flora. . Betula occidentalis. Accessed: Jul 20 2025.