Sunset magazine’s Fresh Dirt blog has a bunch of pretty pictures and tips for finding flowery goodness.

The Midpeninsula Regional Open Space District holds multiple guided walks each weekend at their dozens of protected swaths of open space on the Peninsula and in the South Bay. (Click here for a schedule.) I particularly like the 12 miles of trails at Windy Hill Open Space Preserve, where you can spot both woodland flowers like this hound’s tongue (above) and giant trillium (below) and grassland flowers like Clarkia blooming in the open trails along Skyline Road. Of course, for dramatic fields of flowers, it’s hard to compete with Russian Ridge Open Space Preserve; its relatively high altitude means that wildflower season stretches into May there most years.

Long as we’re on the subject, Rebecca at Calipidder.com saw a bunch of pretty ones near Point Reyes last weekend.

A few more links:
bayareawildflowers.com — has PDFs of multiple wildflower varieties (big files, around 9 mb), sorted by flower color, plant family and scientific name.

Bay Nature has another very informative page, with this nugget for South Bay folks:

Santa Clara: Stile Ranch Trail, Santa Teresa County Park

This hillside has been called a “wildflower-covered rock garden” and also boasts great views of the valleys below. A short, zigzagging, uphill trail winds through diverse wildflowers that thrive in serpentine soil, including pink shooting stars, jewelflowers, and spring beauties; yellow sanicles and goldfields; red columbines; blue gilias; and orange poppies.

To get there: Almaden Expwy south to the end, turn right on Harry Rd, left on McKean Rd, and left on Fortini Rd. Park just beyond the intersection of Fortini and San Vicente.

I’ve been meaning to check out Santa Teresa.

And finally: all posts here containing the word “wildflowers”