californica and Camissoniopsis bistorta, which can make identification difficult when plants are still in their vegetative stages. M. californica has rosettes of elongated leaves, but they tend to have rounded or truncated leaf apices and only slightly papillate leaves that are hairy on the edges. C. bistorta has a wider range of sizes, but has a mean rosette size of around . C. bistorta is easier to distinguish because their leaves tend to be more purplish-gray, with dense, white, coarse pubescence and a purple underside of the leaf, along with an acute leaf apex. Distribution and habitat The plant requires open habitat near the coast, such as sandstone bluffs and openings in maritime chaparral. About 82% to 93% of San Diego County's maritime chaparral habitat has been destroyed for development and damaged by human activity such as recreation; there are just over 3000 acres remaining. All the known occurrences are within five kilometers of the coastline. It grows on soils of white sand which are neutral or somewhat acidic and low in organic material. The substrates originate from iron-rich sandstone. Conservation The plant was believed to be extinct until it was re-discovered on Point Loma. Since its re-discovery, two additional populations were discovered on Naval Base Point Loma, and one small population is seen infrequently at Oak Crest Park in Encinitas, California. Lately, this population has been made up of one single plant. Most of its historic range has been developed, but due to its diminutive, infrequent nature, there is a significant chance that other undiscovered populations exist, possibly at Torrey Pines State Park, where it has been noted before. The most recent estimate for a total remaining global population is between 470 and 3000 individuals. It is a federally listed endangered species of the United States. The worst threat to the species is the invasion of non-native plant species, such as ice plant (Carpobrotus edulis) and Natal grass (Melinis repens). The plant is threatened by its limited number of populations and small population size, which increase the likelihood of extinction; the plant may be naturally rare, but its rarity is exacerbated by other conditions, such as fire suppression. References External links Jepson Manual Treatment Photo gallery orcuttiana Endemic flora of California Natural history of the California chaparral and woodlands Natural history of San Diego County, California Point Loma, San Diego