Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Population occupies less than one hectare (USFWS 1995).

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Ecology

Habitat

Comments: A coastal terrace with a cobbly surface. Associates include owl's clover (Castilleja exserta), goldfields (Lasthenia californica), and non-native grasses.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 1 - 5

Comments: Only one population left (USFWS 1995).

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: T1 - Critically Imperiled

Reasons: Known only from the type locality on Santa Rosa Island off the coast of southern California. The single population consists of about 2,000 plants. Grazing and trampling by (non-native) cattle were threatening the species, but an electric fence has been erected to protect the plants and the federally threatened western snowy plover (Charadrius alexandrinus nivosus). Cattle have periodically breached the fence, but the overall threat has diminished.

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Threats

Comments: Removed from the USFWS list of species proposed as endangered due to the determination that it is only vulnerable to extinction due to random events, such as drought, and storms (July 31, 1997).

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