A newly described local endemic species, Arctostaphylos ohloneana M.C. Vasey and V.T. Parker, is found scattered within populations of another geographically restricted manzanita species, Arctostaphylos glutinosa Schreiber, from the “Lockheed Chalks” area on siliceous shale ridges, northern Ben Lomond Mountain, western Santa Cruz County. This species is found in at least four scattered occurrences within the distribution of A. glutinosa on private property owned by the Lockeed Martin Corporation at the end of Empire Grade Road. Arctostaphylos ohloneana superficially resembles A. pungens and A. manzanita, but it presents distinctive characters that separate it from these two species. Unlike the tetraploid A. manzanita, A. ohloneana is diploid, and it lacks the distinctive nascent inflorescence of A. pungens. Since neither A. pungens nor A. manzanita occurs in the Santa Cruz Mountains, A. ohloneana is all the more remarkable by virtue of its distinctiveness compared to other nearby species.
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Vol. 55 • No. 3