Regularity: Regularly occurring
Global Range: California: found in the northern part of San Diego, and from the Torrey Pines to Del Mar, i.e. Crest Canyon Preserve, La Jolla, Soledad Park and Carmel Mountain.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 1 - 5
Comments: Eight occurrences but only a few viable.
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: T1 - Critically Imperiled
Reasons: California state endemic, few occurrences, real threat from urbanization.
Comments: High urbanization threat.
Dudleya blochmaniae subsp. brevifolia
Dudleya blochmaniae subsp. brevifolia is a succulent plant known by the common name Short-leaved Liveforever or Short-leaved Dudleya. This plant is a rare subspecies of Dudleya blochmaniae with an extremely limited and endemic range in San Diego County, California.
It grows into a somewhat erect, small (1–4 cm), cryptic, and corm-like succulent perennial with cone-shaped leaves along its hidden stem. It may be brown, reddish-purple, or greenish and bears a branching inflorescence with a few flowers per branch, each opening into a star-shaped bloom with five pointed petals. It sprouts after significant winter rains (December to February) and flowers from May to June. It produces a many-seeded fruit from a simple pistil, which disperses seeds along a single suture. It is only found on bare surface hardpans of Torrey sandstone with minimal topsoil. Small marble-sized, iron-bearing granules are present at all sites and are likely an edaphic requirement.
Total population estimates vary by year and by researcher. Extensive studies have been completed on Carmel Mountain, Carmel Valley, San Diego. The Multiple Species Conservation Program (MSCP) of San Diego County estimated the Carmel Mountain population at just 1446 individuals in 2002, and at 113,134 individuals in 2006. Most recently, in 2008, UCLA faculty Dr. Hartmut S. Walter and Matthew Luskin estimated the Carmel Mountain population at over 100,000 individuals. Their population is highly dependent on rainfall, exploding in population when there is annual rainfall over 10 inches, and drastically shrinking when there is less than 4 inches of annual rainfall.
Dudleya blochmaniae subsp. brevifolia is a high conservation priority because it exists only in these 5 locations (listed by decreasing average yearly population): Torrey Pines State Reserve, Carmel Mountain (on multiple sites), Crest Canyon, Skeletal Canyon, and Torrey Pines Extension. The total habitat outside of the Torrey Pines State Reserve that contains this species was estimated at just 2,667 square meters.
Dudleya blochmaniae subsp. brevifolia is listed as an endangered species in California (listed January 1982). On October 7, 1996, the U.S. Fish and Wildlife Service withdrew federal protection as an endangered species citing the threats to the species had diminished and that it was a "covered species" within the Multiple Species Conservation Program (MSCP) of southern San Diego County.
- usgs.gov" Dudleya blochmaniae subsp. brevifolia
- fws.gov: Dudleya blochmaniae subsp. brevifolia — Endangered species
- http://www.dfg.ca.gov/habcon/cgi-bin/read_one.asp?specy=plants&idNum=91 dfg.ca.gov: Dudleya blochmaniae subsp. brevifolia]
- California Native Plant Society. 2001. Inventory of Rare and Endangered Plants of California. (database) Rare Plant Scientific Advisory Committee, California Native Plant Society. Sacramento, CA. Data tables from electronic copy of the Inventory.
- http://www.sandiego.gov/planning/mscp/pdf/monitor/dudleyabre2003.pdf Sandiego.gov: Dudleya blochmaniae subsp. brevifolia monitoring]
- Hickman, J. C. (editor) 1993. The Jepson manual: higher plants of California. Berkeley, CA. University of California Press.
Names and Taxonomy
Comments: Treated at the subspecies level by USFWS (2/96) and by Kartesz (1999); has also been treated at the species level as D. brevifolia (e.g., by Kartesz, 1994).
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