A Refuge for the Rare and Endangered "The Bay Area is incalculably fortunate to have a unique oasis of biodiversity at San Bruno Mountain...In my book, The Diversity of Life, I highlighted San Bruno Mountain as one of eighteen global biodiversity 'hotspots' in need of immediate protection..." -E.O. Wilson, Pellegrino University Research Professor, Emeritus at Harvard University Of the more than thirty species of butterflies that live on San Bruno Mountain, three are listed as endangered and one as threatened under the Endangered Species Act. A A D E r r a i i r v e e i c l l i d C C B S h h a c e e e h t r r a b b o c o o o h w w l e e s s r y k k y y C C o o r r k k i i d d i i Mission Blue Butterfly Callippe Silverspot Butterfly San Bruno Elfin Butterfly San Francisco Bay Checkerspot Butterfly Federally Endangered Federally Endangered Federally Endangered Federally Threatened Over 300 species of native plants grow on San Bruno Mountain. Many are rare and some are exclusively endemic to the mountain—they're found nowhere else on Earth. A r Arctostaphylos imbricata grows low to the ground Z i e a l along the windy western ridge of the mountain c C h overlooking San Francisco—whenever the fog clears. h J e o r h A b n r o i s w e o l s n C k y h e C r o b r o k w i d s i k y C Diablo Sunflower San Francisco Spineflower o r (Helianthella castanea) (Chorizanthe cuspidata var. cuspidata) k i California Rare Plant Rank 1B.2 California Rare Plant Rank 1B.2 d i A T r o i e n l i C C h o e r r e b l o l i w s k y C o r k i d i Coast Iris (Iris longipetala) San Bruno Mountain Manzanita (Arctostaphylos imbricata) California Rare Plant Rank 4.2 Limited Distribution California Rare Plant Rank 1B.1 Endangered Plant A A S A c r r l a o i i e e n t l l t e C C S G i h h m r e e a r r o y b b n o o o w w s s k k y y C C o o r r k k i i d d i i Franciscan Wallflower San Francisco Campion San Francisco Lessingia (Erysimum franciscanum) (Silene verecunda ssp. verecunda) (Lessingia germanorum) California Rare Plant Rank 4.2 Limited Distribution California Rare Plant Rank 1B.2 California Rare Plant Rank 1B.1 Endangered Plant .