ɪɾ ɪz ɛndˈɛmɪk tə mɚɹˈɪn kˈaʊnti, kˌælɪfˈoːɹniə, wˌɛɹ ɪɾ ɪz nˈoʊn ˈoʊnli fɹʌm wˈʌn pˌɑːpjʊlˈeɪʃən ˌɔn ɹˈɪŋ mˈaʊntɪn ˈiːst ʌv mˈɪl vˈæli.
It is endemic to Marin County, California, where it is known only from one population on Ring Mountain east of Mill Valley.