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Hesperocyparis glabra
Male pollen cones
Hesperocyparis glabra red bark peeling on trunk, Coconino National Forest, Arizona
Conservation status
Near Threatened  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Gymnospermae
Division:	Pinophyta
Class:	Pinopsida
Order:	Cupressales
Family:	Cupressaceae
Genus:	Hesperocyparis
Species:	H. glabra
Binomial name
Hesperocyparis glabra (Sudw.) Bartel
Synonyms
Callitropsis glabra (Sudw.) D.P.Little (2006) Cupressus arizonica subsp. glabra (Sudw.) A.E.Murray (1982) Cupressus arizonica var. glabra (Sudw.) Little (1966) Cupressus glabra Sudw. (1910) Neocupressus arizonica var. glabra (Sudw.) de Laub. (2009)

Hesperocyparis glabra, known as the Arizona smooth bark cypress or smooth Arizona cypress, is a conifer native to the American Southwest, with a range stretching over the canyons and slopes in a somewhat wide vicinity around Sedona, Arizona. It is distinguished from Hesperocyparis arizonica by its very smooth, non-furrowed bark which can appear in shades of pink, cherry, and grey.

It is often seen in cultivation, as unlike the Monterey cypress, it has proved to be very resistant to cypress canker.

Taxonomy

Hesperocyparis glabra was scientifically described by George Bishop Sudworth in 1910 with the name of Cupressus glabra. In 1966 the botanist Elbert Luther Little published a paper where he argued that it was a subspecies of what was then Cupressus arizonica. Along with the other new world Cupressus species it was transferred to the new genus Hesperocyparis in 2009. At the same time the authors restored it as a species under its present name.

As of 2024 Hesperocyparis glabra is listed as the accepted species name with no subspecies by Plants of the World Online (POWO), World Flora Online, and the USDA Natural Resources Conservation Service PLANTS database (PLANTS).

References

1. Farjon, A. (2013). "Cupressus arizonica var. glabra". IUCN Red List of Threatened Species. 2013: e.T19708408A19708411. doi:10.2305/IUCN.UK.2013-1.RLTS.T19708408A19708411.en. Retrieved 25 September 2021.
2. ^ "Hesperocyparis glabra (Sudw.) Bartel". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 14 February 2024.
3. Earle, Christopher J. (2023). "Hesperocyparis glabra (smooth Arizona cypress) description". The Gymnosperm Database. Retrieved 14 February 2024.
4. "Hesperocyparis glabra (Arizona Cypress, Cuyamaca Cypress, Piute Cypress, Smooth Arizona Cypress)". North Carolina Extension Gardener Plant Toolbox. North Carolina State University. Retrieved 15 February 2024.
5. Sudworth, George Bishop (1910). "A New Cypress for Arizona". American Forestry. 16. Washington, D.C.: American Forestry Association: 88–90. Retrieved 14 February 2024.
6. Adams, Robert P.; Bartel, Jim A.; Price, Robert A. (2009). "A new genus, Hesperocyparis, for the cypresses of the Western Hemisphere" (PDF). Phytologia. 91 (1): 160–185. Retrieved 14 February 2024.
7. "Hesperocyparis glabra (Sudw.) Bartel". World Flora Online. Retrieved 14 February 2024.
8. NRCS (14 February 2024), "Hesperocyparis glabra", PLANTS Database, United States Department of Agriculture (USDA)

External links

• Media related to Cupressus glabra at Wikimedia Commons
• Cupressus.net: Cupressus glabra
• Gymnosperm database.org: Cupressus glabra

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