Syn.: Cupressus arizonica Greene var. revealiana Silba 1981; Cupressus arizonica Greene subsp. revealiana (Silba) Silba 2005; Hesperocyparis revealiana Silba 2009. Type Mexico: Baja California: Sierra Juarez: El Rincon de Santa Catarina, 1200 m elevation, 1974.04.21, Moran 21251 (Silba 1981).
Evidence from leaf essential oils and DNA sequences indicates that this taxon is closely related to but distinct from Cupressus montana (Adams et al. 2014). The analysis using chloroplast DNA found C. revealiana sister to C. montana in a clade sister to C. arizonica+forbesii+glabra+guadalupensis+stephensonii, while the leaf essential oil analysis indicated distinct compositions for the two species, with no evidence for hybridization. On this basis it is sufficiently distinct from other Cupressus in the California-Arizona-Mexico region to warrant treatment as a distinct species.
Trees to 20 m tall. Crown dense, bushy. Bark smooth, brownish-red, soon exfoliating in short strips. Foliage gray-green, scale-like, 1-1.5 mm long, glands apparent. Pollen cones 3-4 × 1.8 mm with 8-12 scales. First-year cones glaucous. Mature cones serotinous, glaucous brown, pendant in small clusters of 1-3 cones on peduncles longer than the cone diameter, 15-20 mm diameter with prominent umbos, composed of 6-10 scales. Seeds brown, often glaucous. Cotyledons 3-6, 9-10 mm long (Silba 1981, Bisbee and Maerki 2012).
The type locality is the Rincon de Santa Catarina in the Sierra Juarez of Baja California, and all collections have been from near this location, which is at about 31.65°N, 115.8°W. The type location is at 1200 m elevation (Silba 1981). Habitat and plant communities appear to have not been described.
The species has not yet been recognized by the IUCN and thus has no formal conservation status. Per IUCN criteria, it would likely be assessed as Critically Endangered due to the isolation, small size, and lack of formal protection.
The epithet revealiana is honors James L. Reveal, noted botanist (over 500 publications at this writing in 2014, and he's still at it!).
Adams, R. P., J. A. Bartel, R. Terry, F. Callahan, and J. Bisbee. 2014. Taxonomy of Hesperocyparis montana, H. revealiana and H. stephensonii: Evidence from leaf essential oils analyses and DNA sequences. Phytologia 96(2):71-83.
Bisbee, J. and D. Maerki. 2012. Cupressus revealiana (Silba) Bisbee, comb. nova validation as a new Cupressus species. Bulletin of the Cupressus Conservation Project 1(1):3-15. Available: www.cupressus.net/bulletin/bulletin01/BullCCP01_1.pdf, accessed 2012.10.30.
Silba, J. 1981. Revised generic concepts of Cupressus L. (Cupressaceae). Phytologia 49(4):393.
Last Modified 2017-11-12