Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: Limited to the southwestern corner of Oregon.

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Ecology

Habitat

Comments: Wet, open, serpentine valley bottomlands; meadows, intermittent creeks, depressions, swales, ditches.

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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: 21 - 80

Comments: 64 occurrences at 1km separation distance.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: T3 - Vulnerable

Reasons: Although Limnanthes alba ssp. gracilis is limited in habitat and threatened by a variety of factors, occurrences and population numbers are fairly high. Afer the last assessment in 1997, 20+ populations and 50,000+ plants were discovered. Residential and commercial development has increased dramatically in areas where this subspecies occurs. Populations on public lands are subject to timber sale activities and cattle grazing. Impacts from off-road vehicles and road construction and maintenance affect both public and private populations.

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Global Short Term Trend: Relatively stable to decline of 30%

Comments: Either stable or declining slightly.

Global Long Term Trend: Unknown

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Threats

Degree of Threat: High

Comments: One of the larger populations (10,000+) has already been severely impacted by heavy equipment action from highway construction. Two of the 10,000+ populations are part of a timber sale. One of the other 10,000+ populations is on private property leaving only one of the larger populations so far unthreatened on public lands. Potential threats noted on the records are: cattle grazing, off-road vehicle use, mining claims and activities, agriculture conversion, road right-of-way activities, ditch construction and maintenance and competition from exotic weeds.

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Disclaimer

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