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Quercus variabilis is a medium-sized to large deciduous tree growing to 25–30 metres (82–98 feet) tall with a rather open crown, and thick corky bark with deep fissures and marked by sinuous ridges.
– California scrub oak – # California; Quercus bicolor Willd. – swamp white oak – eastern and midwestern North America; Quercus × bimundorum E.J.Palmer — two worlds oak; Quercus boyntonii Beadle – Boynton's post oak – south central North America; Quercus canariensis Willd. – Mirbeck's oak or Algerian oak – # North Africa & Spain
The wood of a red oak Quercus cerris (the Turkey oak) has better mechanical properties than those of the white oaks Q. petraea and Q. robur; the heartwood and sapwood have similar mechanical properties. [71] Of the North American red oaks, the northern red oak, Quercus rubra, is highly prized for lumber.
Live oak was widely used in early American butt shipbuilding.Because of the trees' short height and low-hanging branches, lumber from live oaks was used in curved parts of the frame, such as knee braces (single-piece, L-shaped braces that spring inward from the side and support the deck), in which the grain runs perpendicular to structural stress, making for exceptional strength.
Quercus sect. Quercus has been known, either in whole or part, by a variety of names in the past, including Quercus sect. Albae, Quercus sect. Macrocarpae and Quercus sect. Mesobalanus. Members of the section may be called white oaks. The section includes all white oaks from North America (treated by Trelease as subgenus Leucobalanus). [2]
Quercus montana, the chestnut oak, is a species of oak in the white oak group, Quercus sect. Quercus. It is native to the eastern United States , where it is one of the most important ridgetop trees from southern Maine southwest to central Mississippi , with an outlying northwestern population in southern Michigan .
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]
Quercus douglasii, known as blue oak, is a species of oak endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada. [4] It is California's most drought-tolerant deciduous oak, [5] and is a dominant species in the blue oak woodland ecosystem. It is occasionally known as mountain oak and iron oak. [6] [7]