on exposed granite of low hillside with Agave sobria, Cylindropuntia alcahes, Fouquieria diguetii, Euphorbia misera, Atriplex barclayana. Plants dwarfed by thin soil, wind and extreme xeric environment providing moisture largely from coastal fog.
riparian corridor of small tributary of Rio Verde in narrow canyon cut in volcanic rhyolitic tuff. Plants in volcanic silts, coarse soils, mixed gravels and scattered large boulders of canyon bottomland.