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Old Saint Hilary’s Open Space Preserve 
201 Esperanza St.
Tiburon, CA 94920
415-499-6387
https://www.marincountyparks.org/parkspreserves/preserves/old-saint-hilarys
Nature Preserve: Birding, Hike, Picnic, Walk
Today, this 122 acre preserve is the only place to see the extremely rare Tiburon jewelflower. This odd member of the mustard family has such dark maroon petals that they appear to be nearly black, thus earning the scientific name Streptanthus niger. These flowers may usually be seen in mid-May along the Vistazo Fire Road, which traverses the lower portion of the preserve. A small, steep trail connects the lower route to the Heathcliff Fire Road that crosses the upper slope. Views from the top of the hill (where the preserve adjoins the Tiburon Uplands Preserve) are fabulous. One can sit atop this windswept slope and fully appreciate how lucky we are to have saved this slice of unique habitat.