Short-leaved Dudleya [Dudleya blochmaniae (Eastw.) Moran ssp. brevifolia Moran]

Short-leaved Dudleya [Dudleya blochmaniae (Eastw.) Moran ssp. brevifolia Moran]

Listing CNPS List 1B R-E-D Code 3-3-3

State/Federal. Status -- CE/PE CRASSULACEAE April

Global Rank G3T1 State Rank S1.1

Distribution: San Diego County

Habitat: Open areas of Chamise Chaparral on Torrey sandstone with soils mapped as Carlsbad gravelly loamy sand are the preferred habitat. Small marble-sized, iron-bearing concretions have been observed at all known sites for this cryptic, corm-like sprouting perennial. Competition from other plants is very limited and usually only a few other species such as Selaginella cinerascens are present.

Known Sites: A healthy population occurs at the southern extension of Torrey Pines Preserve; a much smaller colony is found at Crest Canyon Preserve near the northern extension of this state park. A localized and dense population is situated on the west-facing slope of Carmel Mountain above the old quarry; a substantial population is reported nearby on the east side of the Carmel Mountain mesa. Data Base reports a site at the northern extension of Torrey Pines State Reserve south of Del Mar Heights School; also a site where possibly extirpated at the junction of Del Mar Coast Boulevard and 13th Street; and an historical collection from near Mount Soledad. Probable hybrids between this species and Dudleya variegata were observed north of Eastgate Mall Road; they had pale, cream yellow flowers.

Status: Short-leaved Dudleya is presently stable in San Diego County. This County endemic is endangered by the proposed construction of new homes near the Carmel Mountain sites. This tiny succulent cannot be adequately censused for except during the spring following the "corm" sprouting of leaves, and during the short flowering period. Late in the season the minute leaves dry and shrivel quickly. This species is recommended for Federally Endangered status. All sites should be fully protected with adequate buffers.


Copyright May 1994 Craig H. Reiser.

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