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The leaves are 8–20 centimetres (3 + 1 ⁄ 4 – 7 + 3 ⁄ 4 inches) long and 3–6 cm (1 + 1 ⁄ 4 – 2 + 1 ⁄ 4 in) wide, with 14–20 small saw-tooth-like triangular lobes on each side, with teeth of very regular shape. [3] The flowers are wind-pollinated catkins.
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]
[6] [9] The trees grow slowly, about 30 cm (12 in) per year. [10] Individual trees over 500 years old have been recorded. [11] The bark is light gray with many medium-sized dark cracks. The blue-green leaves are tough and leathery, [4] deciduous, 4–10 cm (1 + 1 ⁄ 2 –4 in) long, and entire or shallowly lobed.
Quercus chrysolepis, commonly termed canyon live oak, canyon oak, golden cup oak or maul oak, is a North American species of evergreen oak.Its leaves are a glossy dark green on the upper surface with prominent spines; a further identification arises from the leaves of canyon live oak being geometrically flat.
A specimen in the Arnold Arboretum leafing out in spring. The American basswood is a medium-sized to large deciduous tree reaching a height of 18 to 37 m (60 to 120 ft) exceptionally 39 m (128 ft) with a trunk diameter of 1–1.5 m (3–5 ft) at maturity.
The leaves can be mistaken for those of the catalpa. The very fragrant flowers, large and violet-blue in colour [14] are produced before the leaves in early spring, on panicles 10–30 centimetres (4–12 in) long, with a tubular purple corolla4–6 centimetres (1 + 1 ⁄ 2 – 2 + 1 ⁄ 4 in) long resembling a foxglove flower.
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 palustris, also called pin oak, [4] swamp oak, or Spanish oak, [5] is a tree in the red oak section (Quercus sect. Lobatae) of the genus Quercus.Pin oak is one of the most commonly used landscaping oaks in its native range due to its ease of transplant, relatively fast growth, and pollution tolerance.