In the past, there has been considerable debate about the actual extent of this species (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.). Little (1966, 1970) assigned Cupressus arizonica, C. glabra, C. montana, C. nevadensis and C. stephensonii status as varieties of C. arizonica, and Eckenwalder (1993)) did not even recognize the varieties, although all were again recognized in the comprehensive morphological analysis of Farjon (2005). However, each of these taxa has been described as a distinct species, having different distributions and consistent differences in morphology, chemistry, and molecular genetic characters (Wolf 1948, Little 1966, 1970, Silba 1981, Bartel et al. 2003, Little et al. 2004, Farjon 2005, Little 2006, Adams et al. 2010). Certain authors have noted that the morphological differences between the species are for the most part related to their differing ecological settings (e.g., more waxy cuticles in the more desert-adapted groups, serotinous cones in populations experiencing frequent fire). However, the differences include certain cone characters, which are conventionally interpreted as taxonomically significant in the Cupressaceae; and the molecular genetic differences (Little et al. 2004, Little 2006) have no apparent relationship to ecological variability. It is thus appropriate to treat them as distinct taxa. They are here treated as species.
"[T]ree up to 25 m high; bark gray to black-brown, furrowed; branches horizontally spreading; crown broadly conical; shoots short, thick, four-sided, spreading in all directions; foliage scale-like, mostly 2 mm long, acuminate, usually glaucous-green; resin gland on the dorsal side of the leaf not conspicuous or only slightly so; cones shortly petiolated, globose, 2-3 cm large, dark red-brown, bluish pruinose, composed of 6 to 8 scales with prominent dorsal processes; seeds 4-5 mm long, dark brown, occasionally bluish pruinose, cca 90-120 to a cone; cotyledons 4-5" (Vidakovic 1991).
USA: Texas, New Mexico, SE Arizona; Mexico: Chihuahua, Coahuila, Durango, Tamaulipas, Zacatecas; at 1000 to 1500 m in the US, and up to 2200 m in Mexico (Vidakovic 1991, Farjon 1998). Bartel (1993) identifies it as occurring from Big Bend in Texas, northwest to Greenlee County and the Santa Catalina Mountains in Arizona, with Cupressus glabra occurring in still more northwestern portions of Arizona. Adams (2008) places it in the 4-corners area of Coahuila-Chihuahua-New Mexico-Arizona and northwest from there through central Arizona to the Prescott area. Hardy to Zone 7 (cold hardiness limit between -17.7°C and -12.2°C) (Bannister and Neuner 2001).
Height 28 m, dbh 194 cm, crown spread 15 m, in the Santa Catalina Mountains of AZ (American Forests 2000).
Has been used in one ecological study (Parker 1980), but no other applications are recorded.
Can be seen at several points along the Mt. Lemmon Highway, Santa Catalina Mountains, Arizona; most notably, in Seven Cataracts Canyon.
Adams, Robert P. 2008. Junipers of the World: The Genus Juniperus. Second edition. Trafford Publishing. Brief versions of the descriptions are available online at Adam's website, www.juniperus.org.
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, J. A. 1993. Cupressaceae: Cypress family. Journal of the Arizona-Nevada Academy of Science 27:195-200.
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.
Bartel, J. A., R. P. Adams, S. A. James, L. E. Mumba and R. N. Pandey. 2003. Variation among Cupressus species from the western hemisphere based on Random Amplified Polymorphic DNAs (RAPDs). Biochem. Syst. Ecol. 31:693-702.
Parker, A. J. 1980. The successional status of Cupressus arizonica. Great Basin Naturalist 40(3): 254-264.
Adams, R. P. and J. A. Bartel. 2009. Geographic variation in Hesperocyparis (Cupressus) arizonica and H. glabra: RAPDs analysis. Phytologia 91(1):244-250.
Farjon (2005) provides a detailed account, with illustrations.
Last Modified 2017-12-29