West Peninsular Ranges in Orange, Riverside, and San Diego Counties [1, 2]. Northwestern Baja California, Mexico.
Known Populations in San Diego County
Six occurrences on Conserved Lands in MUs 3 (BLM, Marron Valley, Otay Mountain Wilderness Area, Otay Ranch Preserve) and 9 (Cleveland National Forest).
Clay, gabbroic, or metavolcanic chaparral and closed-cone coniferous forest . Elevation range 80-1500 meters. Often found in the wildland urban interface of Southern California chaparral .
Taxonomy and genetics
Cupressaceae family . Synonyms include Callitropsis forbesii, Cupresses forbesii, and Cupresses guadalupensis ssp. forbesii.
Life history demography
Perennial evergreen tree . Fire adapted with a fire interval of 30-40 years . Seed bank is influenced by fire intervals due to "immaturity risk" and "senescence risk". Less frequently burned lower-slope stands act as seed source for the intermittent recolonization of upper slopes .
Pollination seed dispersal
Obligate seeder with serotinous cones . Thin coated seeds are incapable of retaining fertility for long once exposed . Requires bare mineral soil for seedling establishment.
Alteration of fire regimes, drought, climate change, air pollution, invasive plants, and human disturbance .
Single most important thing land managers can do is reduce fire frequency . The cumulative effects of multiple threats in the context of climate change need to be considered prior to assisted colonization . Must also consider the species composition and fire history of the recipient area. Thorne's hairstreak butterflies (Mitoura thornei) depend on the Tecate cypress . Prime habitat for the San Diego horned lizard (Phrynosoma coronatum blainvillii).
Tecate cypress sources
 CNPS, Rare Plant Program. 2016. Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. http://www.rareplants.cnps.org, accessed 09 September 2016.
 Bartel, J.A. 2016. Hesperocyparis forbesii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=89295, accessed on September 09, 2016.
 Markovchick-Nicholls, L. 2005. “Southern Californian Obligate Fire Seeder, Cupressus Forbesii: Population Status, Research Prioritization, and Management Options.” San Diego State University.
 Rodriguez-buritica, S., K. Suding, and K. Preston. 2010. “Santa Ana Mountains Tecate Cypress ( Cupressus Forbesii ) Management Plan.”
 Borchert, M., M. Johnson, D. S. Schreiner, and S. B. Vander Wall. 2003. “Early Postfire Seed Dispersal, Seedling Establishment and Seedling Mortality of Pinus Coulteri (D. Don) in Central Coastal California, USA.” Plant Ecology 168 (2): 207–20. doi:10.1023/A:1024447811238.
 Dunn, A. T. 1985. “The Tecate Cypress.” Fremontia 13 (3).
 Regan, H. M., A. D. Syphard, J. Franklin, R. M. Swab, L. Markovchick, A. L. Flint, L. E. Flint, and P. H. Zedler. 2012. “Evaluation of Assisted Colonization Strategies under Global Change for a Rare, Fire-Dependent Plant.” Global Change Biology 18 (3): 936–47. doi:10.1111/j.1365-2486.2011.02586.x.
 de Gouvenain, R. C., and A. M. Ansary. 2006. “Association Between Fire Return Interval and Population Dynamics in Four California Populations of Tecate Cypress (Cupressus Forbesii).” The Southwestern Naturalist 51 (4): 447–54.