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Wildflower Identification Guide

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Wildflower Identification Guide

The photos in this wildflower identification guide are intended to help you identify the wildflowers that you may see in Mount Diablo State Park throughout the blooming season. The photos were taken by volunteers and do not necessarily include specific features necessary to identify the flowers.

Select a color category below. The color of a flower is sometimes difficult to classify for a variety of reasons (such as lighting, camera used, or device used to view the picture), so if you don’t find the flower in one color category, try another. The wildflowers are then listed in alphabetical order by common name of the plant. Some plants are known by more than one common name, so be sure to check them all if you are seeking a specific name. Don't forget to click the picture to get a closer look!

Typical bloom months are also listed. Bloom dates vary from year to year depending on the weather. The same plant may be in bloom at different times, depending on its location and elevation. The “What Blooms on Mount Diablo” list below lists wildflowers that typically are in bloom during the current month.
Blue/Purple wildflowers
Red/Pink wildflowers

Yellow/Orange and Green wildflowers

What's blooming on Mount Diablo.
Common Name Common Name Common Name Common Name
Alkali Heliotrope, Seaside Heliotrope Bull thistle Bindweed, Orchard Morning-Glory California Sagebrush
Kellogg's Snapdragon California Fuchsia, Hummingbird Fuchsia, Zauschneria California Buckwheat California Sunflower
Tall Stephanomeria, Rod Wirelettuce Christmas Berry, Christmas Holly, Toyon Chaparral Clematis, Old Man's Beard Coyote Bush male
 Vinegar Weed Lesser Herb Robert Common Plantain Golden Aster, Sessileflower False Goldenaster
  Red Rock Penstemon Coyote Bush - female Golden-fleece
  Red Sand-spurry, Small-flower Catchfly Naked Buckwheat Great Valley Gumplant, Gumplant, Gumweed
  Scarlet Monkeyflower, Red Monkeyflower   Heermann's Tarweed
  Snapdragon   Mugwort
      Oak Mistletoe
      Snakeroot, Gamble Weed, Pacific Sanicle

Some additional resources:

  • The Flowering Plants and Ferns of Mount Diablo California, Barbara Ertter and Mary L. Bowerman, 2002Plants of the San Francisco Bay Region, Mendocino to Monterey, 3rd edition, Linda H. Beidleman and Eugene N. Kozloff, 2014
  • The Jepson Manual, Vascular Plants of California, 2nd edition, edited by Bruce G. Baldwin, Douglas Goldman, David J Keil, Robert Patterson, Thomas J. Rosatti, and Dieter Wilken, 2012
  • Spring Wildflowers of Henry W. Coe State Park and the Inland San Francisco Bay Area, Barry Breckling, 2008
  • Plants of the East Bay Parks, Glenn Keator, 1994
  • Mt. Diablo Wildflowers booklet, Mount Diablo Interpretive Association, 2005
  • Jepson eflora:
   This guide is a work in progress, conceived and maintained by volunteers. If you have questions or comments about the contents of the guide, please email:   info CAPTCHA graphic