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Quercus agrifolia, the California live oak, [3] or coast live oak, is an evergreen [4] live oak native to the California Floristic Province.Live oaks are so-called because they keep living leaves on the tree all year, adding young leaves and shedding dead leaves simultaneously rather than dropping dead leaves en masse in the autumn like a true deciduous tree. [5]
California Native Plants for the Garden, Carol Bornstein, David Fross, and Bart O'Brien, Cachuma Press; California Native Trees and Shrubs, Lee W. Lenz, Rancho Santa Ana; Ceanothus, David Fross and Dieter Wilken, Timber Press; Complete Guide to Native Perennials of California, Glenn Keator, Chronicle Books
Trees are long lived, with an estimated lifespan between 250–280 (300 maximum) years. The leaves are dark green, palmately compound with five (rarely seven) leaflets. Each leaflet is 6–17 cm (2.4–6.7 in) long, with a finely toothed margin and (particularly in spring) downy surfaces.
The "Henley Oak", in Covelo, California, is the tallest known valley oak, at 47 m (153 ft). [7] [8] The branches have an irregular, spreading and arching appearance. During autumn, the leaves turn a yellow to light orange color but become brown later in the season. In advancing age, the branches droop. The trees have pewter-colored rippled bark ...
The stems are resinous, oily, and glabrous to puberulent, with stipules less than 1.5 mm. [4] Emerging from the stems are alternate spirally arranged leaves, and sometimes branches. The leaves are linear, often 5 to 10 mm long, and shaped like needles. [5] They are shaped nearly round in cross section, and end apiculate, or with a sharp tip. [3]
During the summer months when the sun warms the North Pacific, the subtropical ridge bends north between Hawaii and California, and in doing so blocks moist air from flowing off the ocean and onto ...