Map_thumbnail_large_font

Cupressus macnabiana

Status_ne_offStatus_dd_offStatus_lc_onStatus_nt_offStatus_vu_offStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA PINOPSIDA PINALES CUPRESSACEAE

Scientific Name: Cupressus macnabiana
Species Authority: A.Murray bis
Common Name/s:
English MacNab Cypress, Fragrant Cypress, Shasta Cypress
Synonym/s:
Hesperocyparis macnabiana (A.Murray bis) Bartel

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.
Justification:
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.

Geographic Range [top]

Range Description: This species is native to the USA: California, Coast Ranges, mountains of northern California, Sierra Nevada.
Countries:
Native:
United States (California)
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.
Population Trend: Stable

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.
Systems: Terrestrial

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. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please fill in the feedback form so that we can correct or extend the information provided