Regularity: Regularly occurring
Global Range: Monterey, Marin, and Sonoma Counties (Skinner 1997).
Comments: Occurs on partially stabilized coastal dunes up to about 8 m high in the mild maritime climate of the central California coast and grows in coastal dune communities in association with Menzies' wallflower, sand gilia, beach sagewort, sand verbena, and mock heather (Fish and Wildlife Service 1997).
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 6 - 20
Comments: Known from nineteen extant populations (Fish and Wildlife Service 1997).
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G1 - Critically Imperiled
Reasons: Endemic to California, Lupinus tidestromii is known as two varieties, var. tidestromii and layneae, in Marin, Monterey, and Sonoma Counties. The lupine is known from nineteen extant occurrences with only 433 individuals; two populations on the Monterey Peninsula were eliminated by the construction of a golf course. The major threats to L. tidestromii are invasion by non-native plants, and loss of habitat due to development, trampling by hikers and equestrians, and livestock grazing.
Date Listed: 06/22/1992
Lead Region: California/Nevada Region (Region 8)
Listing status: E
For most current information and documents related to the conservation status and management of Lupinus tidestromii, see its USFWS Species Profile
Comments: Major threats are invasion by non-native plants, such as iceplant and European beachgrass and loss of habitat due to development, trampling by hikers and equestrians, and livestock grazing. Populations on private lands are potentially threatened by residential and recreational development (Fish and Wildlife Service 1997).
Lupinus tidestromii, Tidestrom's lupine, is a rare species of lupine known by the common names clover lupine and Tidestrøm's lupine. It is endemic to the coastline of California just to the north and south of the Golden Gate in Sonoma, Marin, and Monterey Counties. It is a plant of the sand dunes at separate beach locations in these counties. A very limited amount of this plant's habitat remains; it is a federally listed endangered species. Construction of golf courses on the Monterey Peninsula caused the extirpation of two known occurrences, and boardwalks were built at Asilomar State Beach to prevent trampling of the delicate dune habitat there.
This is a perennial herb producing a prostrate stem growing along the sand and reaching 10 to 30 centimeters in length. Each palmate leaf is made up of 3 to 5 leaflets measuring 1 or 2 centimeters in length. The herbage is coated in white woolly hairs. The small, upright inflorescence bears whorls of flowers each just over a centimeter in length. The flower is blue or purple with a white, yellow, or purplish patch on its banner. The fruit is a shaggy-haired legume pod 2 or 3 centimeters long.
- USFWS. Six Plants and Myrtle's Silverspot Butterfly from Coastal Dunes in Northern and Central California Determined to be Endangered. Federal Register June 22, 1992.
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