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Wildflower Mount Diablo Woolly Clover Scientific Name: Trifolium tomentosum Family: Fabaceae (Legume Family) Blooms: Apr-Jun Color: White Annual herb Introduced Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Daniel Fitzgerald Daniel Fitzgerald

Mormon Metalmark Apodemia mormo Riodinidae Metalmarks Flies July to October Host Plant Buckwheat Nectar Plant Daniel Fitzgerald Daniel Fitzgerald Underwing Daniel Fitzgerald Daniel Fitzgerald

Wildflower Mount Diablo Spring Vetch Invasive Scientific Name: Vicia sativa Family: Fabaceae (Legume Family) Blooms: Feb - May Color: Red-Pink Annual herb or vine Introduced Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Mike Woodring

Geology: Our understanding of the geological history of the rocks and structure of Mount Diablo has undergone major changes during the past 30 years, and even now geologists are still trying to unravel the complicated history of the mountain. This complex history is not unique to the mountain, but to our region as a whole, since Mount Diablo has been caught up in the processes that have shaped the Coast Ranges over the last several million years. Paleontology: Mount Diablo State Park contains geological formations rich in fossil resources. Marine mollusks of Miocene age are abundant along the southern flank of the mountain. Fossil plant material is also common in this area. Along the southern boundary, 9 million year old river deposits have yielded a large number of vertebrate fossil fragments including sabre-tooth cats, mastodons, horses, camels, and llamas. Photo: Devil's Pulpit is an erosion-resistant block of chert standing along Mary Bowerman Trail near the summit of Mount Diablo | Ray Mengel __Mount Diablo Guide 3 cups Blueberries 3 cups Flour 1½ cups Butter Geology: Our understanding of the geological history of the rocks and structure of Mount Diablo has undergone major changes during the past 30 years, and even now geologists are still trying to unravel the complicated history of the mountain. This complex history is not unique to the mountain, but to our region as a whole, since Mount Diablo has been caught up in the processes that have shaped the Coast Ranges over the last several million years. Paleontology: Mount Diablo State Park contains geological formations rich in fossil resources. Marine mollusks of Miocene age are abundant along the southern flank of the mountain. Fossil plant material is also common in this area. Along the southern boundary, 9 million year old river deposits have yielded a large number of vertebrate fossil fragments including sabre-tooth cats, mastodons, horses, camels, and llamas. Photo: Devil's Pulpit is an erosion-resistant block of chert standing along Mary Bowerman Trail near the summit of Mount Diablo | Ray Mengel __Mount Diablo Guide Mount Diablo Geology Featured Articles Geologic History Guide to Mount Diablo Geology Geology FAQ Geology Guides & Maps Geologic Guide to Mount Diablo State Park Geology Road Map Trail Through Time Geology Map of Mount Diablo Geologic Guide to the Falls Trail Loop Mining Clayton Quarry Cowell Cement Industry Gold, Silver, and Copper Mines of Mount Diablo Quicksilver at Mount Diablo ___ Roi Peers

Wildflower Mount Diablo Pacific Hound's Tongue Scientific Name: Cynoglossum grandis Family: Boraginaceae (Borage Family) Blooms: Feb - Mar Color: Blue-Purple Perennial herb Native Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Kevin Hintsa

Wildflower Mount Diablo Jointed Charlock Scientific Name: Raphanus raphanistrum Family: Brassicaceae (Mustard Family) Blooms: March Color: Yellow-Orange Annual or Perennial Introduced Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Steve Beatty

Anise Swallowtail Papilio zelicaon Papilionidae Swallowtails Flies February to November Host Plant Fennel, Lomatium, Tauschia, Native Carrot Family Nectar Plant Michael Marchiano Daniel Fitzgerald Underwing

Wildflower Mount Diablo Chaparral Clarkia Scientific Name: Clarkia affinis Family: Onagraceae (Evening Primrose Family) Blooms: April - July Color: Red-Pink Annual herb Native Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Daniel Fitzgerald Daniel Fitzgerald Daniel Fitzgerald Daniel Fitzgerald

Acmon Blue Icaricia acmon Lycaenidae Blues, Coppers, Hairstreaks Flies All year Host Plant Buckwheat, Legumes Nectar Plant Chamise, Horehound, Coyote bush, Narrow-leaved milkweed Michael Marchiano Early Spring Female Daniel Fitzgerald Male Underwing Daniel Fitzgerald Summer Female

Wildflower Mount Diablo Small California Gilia Scientific Name: Gilia achilleifolia ssp. multicaulis Family: Polemoniaceae (Phlox Familiy) Blooms: Apr - Jun Color: Blue-Purple Annual herb Native, endemic to California Smaller flowers than California Gilia Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Kevin Hintsa

Red-tailed Hawk by Dan Sandri January 1, 2024 Dan Sandri Keep an eye out and an ear open! The Red-tailed Hawk (Buteo jamaicensis) is probably the most common hawk across the country, and is often seen above and around Mount Diablo State Park. Our Red-tailed Hawks are most numerous across California in Winter, when many hawks return from northern lands. These are large, broad-winged hawks that usually (but not always!) exhibit an orange-red tail. Along with the tail, the best indicator that the hawk you are looking at is a Red-tailed Hawk is a brown-streaked “belly-band” (sometimes dark, sometimes more finely-streaked) across the tummy, and dark patagial lines on the front edge of the underside of the wing when seen from below. See the photos for examples of the belly band and patagial lines. Identification can get tricky if the bird is dark Harlan’s subspecies or a dark-morph adult or juvenile. Their preferred food is mammals, such as voles, gophers, ground squirrels, rabbits and the like, but they will also eat lizards, snakes, birds and other animals. Because they have hollow bones, these large hawks are quite light in weight - an adult female might weigh in at only 3 pounds. Their classic, recorded scream can be heard in many a Western movie, even when the bird shown is an eagle or a kite! Bird Guide: https://www.mdia.org/birds-1-1/red-tailed-hawk red-tailed hawk1 DSandri.jpg red-tailed hawk2 DSandri.jpg BACK TO LIST

Wildflower Mount Diablo Hill Star Scientific Name: Lithophragma heterophyllum Family: Saxifragaceae (Saxifrage Family) Blooms: Mar - May Color: White Perennial herb Native, endemic to California U-shape sepal Jump to Blooming Now Blue / Purple Red / Pink White Yellow / Orange Invasive Plants Steven Beatty Stephen Smith, Steve Beatty Comparison of Hill Star with Woodland Star