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Map Satellite These two areas on the southern end of the Tiburon Peninsula support a serpentine grassland with a number of rare and narrow endemics. Among the rare plants here are Castilleja affinis ssp. neglecta and Streptanthus niger, which are known from only the Peninsula. Eriogonum caninum, for which this is the type locality, occurs elsewhere in Marin and the Oakland hills. Allium lacunosum and the rare Hesperolinon congestum are found in Marin County only in this locality; the range of the former extends south to Santa Barbara County, and of the latter, to a few restricted sites in San Mateo County.
Aspidotis carlotta-halliae, a fern which ranges south to San Luis Obispo County, is found in two localities in Marin County, here and on Mount Tamalpais.
In addition to the grassland there is some oak woodland as well as chaparral.
Integrity: There is a dirt road in the area and there have been fires.
Use: Research, educational, observational. Some private.
Ref: Howell, J. T., 1970. Marin Flora, University of California Press, Berkeley and Los Angeles, 366 pp.
February 1978
Inventory of California Natural Areas
Revision © 2008 Steven Louis Hartman
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