Cupressus macnabiana 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Pinopsida Pinales Cupressaceae

Scientific Name: Cupressus macnabiana A.Murray bis
Common Name(s):
English MacNab Cypress, Fragrant Cypress, Shasta Cypress
Hesperocyparis macnabiana (A.Murray bis) Bartel
Taxonomic Source(s): Farjon, A. 2010. A Handbook of the World's Conifers. Koninklijke Brill, Leiden.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2013
Date Assessed: 2011-05-04
Assessor(s): Farjon, A.
Reviewer(s): Thomas, P.
This most common and abundant of the California cypresses has an area of occupancy no more than 200 km² due to the fact that it consists of around 30 “groves” of a few km² at the largest. Many are smaller. However, overall there seems to be no current decline in the population, so it is assessed as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is native to the USA: California, Coast Ranges, mountains of northern California, Sierra Nevada.
Countries occurrence:
United States (California)
Additional data:
Estimated area of occupancy (AOO) - km2:198
Number of Locations:9-10
Lower elevation limit (metres):300
Upper elevation limit (metres):1200
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There are at least 30 “groves” of McNab Cypress; these can be considered subpopulations if sufficiently isolated. Some are extensive (>3 km across) and must contain thousands of mature trees.
Current Population Trend:Stable
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Cupressus macnabiana occurs in the Upper Sonoran Life Zone in chaparral or woodland, associated with Pinus attenuata, P. sabiniana, less commonly P. ponderosa, Quercus spp., and Arctostaphylos sp., often forming groves on rocky slopes and in ravines in clay, loam or sand over serpentine. The altitudinal range is from 300 m to 1200 m a.s.l. The climate is of the Mediterranean type with dry, hot summers and winter rain.
Continuing decline in area, extent and/or quality of habitat:No
Generation Length (years):30

Use and Trade [top]

Use and Trade: This relatively small tree may have been locally used for fence posts by ranchers; today its wood is not considered to be of any commercial value. It is rare in horticultural cultivation.

Threats [top]

Major Threat(s): MacNab Cypress is a widely distributed and common species, with some populations covering large areas and forming the dominant trees. While a significant proportion of the species occurs on public lands with some protection of its natural vegetation guaranteed by legislation, a considerable proportion is on private land where they have. to some extent, been impacted by a range of human activities (Griffin and Critchfield 1972, Mallek 2009).Wildfires are a potential hazard only if their frequency or intensity would exceed levels of sustainability: the species is dependent on fire for successful regeneration and establishment. Fire suppression policies may pose a greater threat (Mallek 2009).

Conservation Actions [top]

Conservation Actions: Several populations occur within protected areas. Monitoring the situation with wildfire frequency and successful regeneration in major subpopulations is recommended to establish long term predictions on the survival of this species, possibly in conjunction with predictions on climate change.

Citation: Farjon, A. 2013. Cupressus macnabiana. The IUCN Red List of Threatened Species 2013: e.T42222A2962703. . Downloaded on 23 October 2017.
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