Smooth Arizona, smooth, or Arizona cypress (Peattie 1950).
Type: Verde Canyon, Yavapai Co., Arizona. See the "Taxonomic notes" section of Cupressus arizonica for discussion of the relationship between various taxa assigned by some authors to C. arizonica. See the "Taxonomic notes" section of Cupressus for a discussion of the relationship between this and other, closely related Cupressus taxa in northwest Mexico and the adjacent Southwest U.S.
C. nootkatensis in cultivation has spontaneously hybridized with C. glabra. The hybrid is Cupressus x notabilis (A. F. Mitchell) Eckenwalder 2009, with synonyms xCupressocyparis notabilis A. F. Mitchell and xCuprocyparis notabilis (A. F. Mitchell) Farjon.
"A tree, when older, with bark thin and cherry-red, or dark-brown as mahagony, exfoliating in thin plates; foliage like that of the typical variety, only with more prominent glands; seeds 4-5 mm long, bluish pruinose" (Vidakovic 1991). It generally resembles Cup. arizonica, but differs in having smooth reddish bark exfoliating in thin flakes and strips, and in having conspicuously, actively glandular foliage (Farjon 2005).
USA: Arizona: Coconino, Gila, Maricopa and Yavapai counties, at 1200-1680 m elevation in piñon-juniper woodlands, usually on poor desert soils of silicate origin (Farjon 2005). Hardy to Zone 7 (cold hardiness limit between -17.7°C and -12.2°C) (Bannister and Neuner 2001).
The range is roughly bounded by Sedona, Payson, and the Mazatzal Mountains (Adams et al. 2010; see map). Common associates include Pinus edulis, P. ponderosa subsp. scopulorum, Juniperus deppeana, J. scopulorum, and J. osteosperma (Farjon 2005).
Height 21.3 m, dbh 158 cm, in Tonto National Forest (American Forests 2000).
Adams, R. P., J. A. Bartel, D. Thornburg, and A. Allgood. 2010. Geographic variation in the leaf essential oils of Hesperocyparis arizonica and H. glabra. Phytologia 92(3):366-387. Available at www.phytologia.org.
American Forests 2000. The National Register of Big Trees 2000. Washington, DC: American Forests. The big tree register is now available online.
Bartel 2009: described in Adams, R. P., J. A. Bartel and R. A. Price. 2009. A new genus, Hesperocyparis, for the cypresses of the western hemisphere. Phytologia 91(1):160-185.
Adams, R. P. and J. A. Bartel. Geographic variation in Hesperocyparis (Cupressus) arizonica and H. glabra: RAPDs analysis. Phytologia 91(1):244-250.
Last Modified 2018-01-13