acute acorns. This stricter conception of Q. dumosa matching the type material has also revealed its rarity, as it is only found in very restricted coastal habitats, making it perhaps one of the rarest and most threatened oaks in California.

Hybridization

Oaks hybridize extensively with other members of their subgenus. Quercus dumosa has a number of natural hybrids where it comes into contact with other white oak species. In the north-central coastal area of San Diego County, from Del Mar to Carlsbad and Poway, populations

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