Blochman's Dudleya [Dudleya blochmaniae (Eastw.) Moran ssp. blochmaniae]

Blochman's Dudleya [Dudleya blochmaniae (Eastw.) Moran ssp. blochmaniae]

Listing CNPS List 1B R-E-D Code 2-2-2

State/Federal. Status -- /C2 CRASSULACEAE Apr.-Jun.

Global Rank G3T2 State Rank S2.2

Distribution: San Diego County, Orange County, Los Angeles County, Ventura County, Santa Barbara County, and San Luis Obispo County; Baja California, Mexico

Habitat: This tiny corm-like sprouting perennial grows in sandy openings in Diegan Sage Scrub near the coast. Las Flores loamy fine sand and Terrace Escarpments are the soil types mapped at Camp Pendleton. Proximity to the coast, or to areas with a strong coastal influence, seems to be a requirement for this species.

Known Sites: A large population of over 1000 individuals was discovered west of the helicopter landing strip, near the beach on Shingle Bluff at Camp Pendleton. It is also found in small colonies just south of Cocklebur Creek on an ocean bluff, and in Military Sector Oscar One west of Mass 3 Road and north of the large power lines. Other populations are reported north of Basilone Road west of Military Sector Bravo Three, and 0.2 km northeast of the Santa Margarita School on Wire Mountain. An historical report from Imperial Beach may be referable to Dudleya variegata. Several hundred are scattered along the ridge north of Dana Point Harbor in Orange County. Reported by Roberts elsewhere in Orange County at San Clemente north of Pico Avenue and in San Clemente State Park. Historical collections to the north include Point Sal Ridge in Santa Barbara County, on a serpentine outcrop near Morro Beach in San Luis Obispo County, and in Long Grade Canyon 1 mile east of Camarillo State Hospital in the northern Santa Monica Mountains. Data Base reports for Los Angeles County are from Point Dume, the mouth of Winter Canyon near Malibu Beach; for Orange County from San Clemente 0.3 km west of Avenue Pico; for Ventura County on the Conejo Grade 3 miles west of Newbury Park, Dos Vientos Ranch southeast of Conejo Mountain in an east/west trending valley, in western Thousand Oaks; in San Luis Obispo County approximately 2 miles north of Cayucos on a seabluff, east of Point Estero northwest of Highway 1 about 4 miles north of Cayucos, west of the intersection of Los Osos Valley Road and Highway 101 just outside city limits of San Luis Obispo, 8 miles west of San Luis Obispo near Morro Bay, and the west base of Bishop Peak.

Two sites from Baja California have recorded specimens at the San Diego Natural History Museum's herbarium: 2 km south of Descanso at the K51 highway marker, and on a volcanic mesa at Los Hornos 9 km southeast of La Mision where collected by Moran (SD 105144).

Status: Blochman's Dudleya is substantially declining throughout its coastal Southern California range. New sightings on Camp Pendleton improve the prognosis for survival of the species in the San Diego region. Plants may be quite difficult to relocate except in late spring and early summer; censusing outside of this period is not recommended for this species. All Southern California populations should be protected.

Copyright May 1994 Craig H. Reiser.

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