Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: USA, s CA, San Diego Co., Cuyamaca L.; the related var. gracilis is from sw OR, in similar edaphic situations.

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Physical Description

Diagnostic Description

Riverside and San Diego counties, California; stems with wide-spreading branches; leaflets pinnatifid into 3-5 oblanceolate segments; nutlets 4 mm long. (Munz, 1959).

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Ecology

Habitat

Comments: Moist lake shores and wet places, yellow pine forest, 4500-5000'.

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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: 6 - 20

Comments: CNPS data. USFWS says fewer than 20 populations known (1994); state rank by Calif. Heritage is 'S2'.

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Life History and Behavior

Life Cycle

Persistence: ANNUAL

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Reproduction

Flowers have same characters as the family (bisexual), but 4 or 5-merous (Bailey and Bailey, 1974).

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: T2 - Imperiled

Reasons: Moderate number of popns, widely disjunct distribution from var. gracilis, another narrow endemic, some threats.

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Threats

Comments: CNPS considers endangered in part of range; threatened by grazing and recreational development.

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Names and Taxonomy

Taxonomy

Comments: Kartesz (1994) treats Limnanthes alba and L. gracilis as distinct taxa. In adddition, Kartesz (1994) recognizes L. gracilis ssp. parishii. FNA vol. 7 (2010) lumps L. alba and L. gracilis, retaining the infraspecific taxon, ssp. parishii, under L. alba.

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Disclaimer

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