San Diego Management & Monitoring Program


Rare Plants
Rarest Plants Project: San Diego Thornmint, Short-leaved Dudleya, Orcutt's Spineflower, Orcutt's Brodiaea, and California Orcutt Grass

January 1, 2014 - May 17, 2022 completed

Project description

The initial goal of this project was to significantly improve the conservation status of three of the rarest and most imperiled plants in San Diego County: Orcutt’s spineflower, San Diego thornmint, and short-leaved dudleya. Proposed work included stabilizing and increasing the size of existing populations, establishing new populations of Orcutt’s spineflower, and providing stewardship. A TransNet EMP grant (#5001767) funded the development and implementation of a conservation strategy that included seed bulking and the establishment of additional populations of Orcutt’s spineflower to help minimize the risk of extinction. SANDAG EMP funds and a Section 6 grant from the California Department of Fish and Wildlife funded GIS mapping of suitable habitat soils and population surveys at remaining natural historic documented occurrences and in newly mapped suitable habitat on conserved lands off the Point Loma Navy Base. Through an additional round of TransNet EMP grant funding (#5004954), the project grew to include Orcutt's brodiaea and California Orcutt grass for the Otay Mesa Rare Plants Project. Project activities included seed bulking for MSP plant species and restoration of vernal pools & maritime succulent scrub & establishment of MSP plant occurrences. One last round of grant funding (#5005511) focused on improving the conservation status of Orcutt's spineflower (SL); short-leaved dudleya (SL), and Orcutt's brodiaea (SO). The project focused on seed bulking for all three species; control of invasive weeds for all three species; establishment of one new Orcutt's spineflower occurrence; supplementation of population numbers and stewardship management to maintain approximately sixteen existing occurrences of Orcutt's spineflower and one existing occurrence each of short-leaved dudleya and Orcutt's brodiaea.


Project groups

SDMMP14

Project Group: Orcutt's Spineflower Enhancement


Project focus

Project type: Habitat restoration

Target species: Orcutt's spineflower

Main implementing entity: The Chaparral Lands Conservancy

Point of contact: Dave Hogan

Project Page manager: Sarah McCutcheon

SDMMP lead: Sarah McCutcheon

Study lead: Dave Hogan


Project Funding

San Diego Association of Governments

Strategic elements

Budget year: pre FY15-1; Work plan objectives number: 5


Files and Documents

2022 Otay Mesa Rare Plants Final Report

Prepared by:The Chaparral Lands Conservancy

2016 Rare Plants Project 10th Quarterly Report (FINAL)

Prepared by:The Chaparral Lands Conservancy

2022 Rarest Plants II Project Final Report

Prepared by:The Chaparral Lands Conservancy

2015 Results of Orcutts Spineflower Mapping and Population Surveys

Prepared by:The Chaparral Lands Conservancy