Regularity: Regularly occurring
Comments: Rocky outcrops within serpentine grasslands at 120-300 m elevation.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 21 - 80
Comments: 48 total occurrences; 44 non-historical
National NatureServe Conservation Status
Rounded National Status Rank: N2 - Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G2 - Imperiled
Reasons: Endemic to a limited habitat in Santa Clara County, California. There are 44 known sites. A large part of the largest population (with about 20,000 plants) is threatened by residential and golf course development. Development threatens several other populations to varying degrees. One population is threatened by off-road motorcycle traffic and illegal dumping.
Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Comments: Serpentine rock endemic.
Global Short Term Trend: Decline of 30-50%
Global Long Term Trend: Decline of 50-70%
Degree of Threat: Very high
Comments: A major threat is development - many occurrences are known to be on private land and most are under some threat of development, both residential and recreational (such as a proposed golf course) (USFWS 1998). Secondary threats associated with development are introduced weedy species, road construction, trampling, and run-off from the proposed upslope golf course (USFWS 1998). Currently a landfill, quarry, and off-road motorcycle recreation area exist in the area and their activities and possible future expansion also pose a threat to this species (USFWS 1998). Other threats include grazing, unauthorized dumping, and over collection (USFWS 1998).
Dudleya setchellii, the Santa Clara Valley Dudleya, is a member of the Dudleya genus of succulent perennials, members of the family Crassulaceae. The Santa Clara Valley Dudleya, endemic to the Santa Clara Valley region in the southern San Francisco Bay Area, was listed on February 3, 1995, as an endangered species.
The Dudleya setchellii plant blooms in the spring, with pale yellow flowers on vertical stems about a foot high.
Dudleya setchellii is found only in the Coyote Valley area of southern Santa Clara County, California, mostly on rocky outcrops within serpentine grasslands on Tulare Hill and the Santa Teresa Hills west of Coyote Creek in south San Jose and south of Metcalf Canyon east of Coyote Creek.
- Dudleya and Hassenthaus Handbook, Paul Thompson 1993, Bonsall Publications, 248 pp
Names and Taxonomy
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