![]() ![]() X Trustworthy Source University of California Division of Agriculture and Natural Resources Extension program of the University of California system devoted to educating and improving local communities Go to source Cup is extremely shallow with thin scales. Blue oak ( Quercus douglasii): found mostly in north and central California.X Research source X Trustworthy Source University of California Division of Agriculture and Natural Resources Extension program of the University of California system devoted to educating and improving local communities Go to source Variation makes identification by acorn tough, but cup scales have loose tips and are never warty. Coast live oak ( Quercus agrifolia): found along the coast.Nut usually at least 1 inch (2.5 cm) long, cup varies but scales at margin are usually loose and may be warty X Trustworthy Source University of California Division of Agriculture and Natural Resources Extension program of the University of California system devoted to educating and improving local communities Go to source California black oak ( Quercus kelloggii): found throughout the state.Here are some of the most common in various parts of California: X Research source ![]() ![]() California is dominated by oaks of many species, and naturally occurring hybrids. Shumard oak ( Quercus shumardii): Similar to Northern red oak, but scales often have pale margins some have a deeper, bowl-shaped cup, but not all.Northern red oak ( Quercus rubra): cup scales are reddish-brown, hairy, often with dark margins inside of cup is smooth or has ring of hair around the scar nut may have grey stripes.Willow oak (Quercus phellos): shallow, flattened cup with hairs inside and out nut is less than ½" (13 mm) long.Scarlet oak ( Quercus coccinea): glossy, dark reddish-brown cup nut has a blunt tip.Chinkapin oak ( Quercus muehlenbergii): thin cup with fine grey hairs and moderately warty scales cup covers ¼ to ½ of nut.White oak ( Quercus alba): short, light grey cup with warty scales cup covers about ¼ of nut.Here are the most common species that fit this description in this region, and their identifying characteristics: X Research source Their nuts are light brown or dark brown in color, with few to no red tones. These acorns have the classic oblong or ovoid acorn shape. ![]() Registered Professional Biologist Expert Interview. This article has been viewed 538,620 times. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. There are 10 references cited in this article, which can be found at the bottom of the page. He has worked in British, North American, and South American ecosystems, and with First Nations communities, non-profits, government, academia, and industry. Mike received a BSc with honors in Ecology and an MA in Society, Science, and Nature from The University of Lancaster in England as well as a Ph.D. Mike also specializes in science communication and providing education and technical support for ecology projects. He has over 20 years of experience in ecology research and professional practice in Britain and North America, with an emphasis on plants and biological diversity. Michael Simpson (Mike) is a Registered Professional Biologist in British Columbia, Canada. This article was co-authored by Michael Simpson, PhD. ![]()
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