Swamp white oak
| Swamp white oak | |
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| Morton Arboretum acc. 71-69-2 | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Fagales |
| Family: | Fagaceae |
| Genus: | Quercus |
| Section: | Quercus |
| Species: | Q. bicolor |
| Binomial name | |
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Quercus bicolor Willd. 1801 |
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| Natural range | |
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Quercus bicolor, the swamp white oak, is a North American species of medium-sized trees in the beech family. It is a common element of America's north central and northeastern mixed forests. It can survive in a variety of habitats. It forms hybrids with bur oak where they occur together in the wild.
Quercus bicolor grows rapidly and can reach 60 to 80 feet (18 to 24 meters) tall with the tallest known reaching 29 m (95 ft) and lives up to 350 years. The bark resembles that of the white oak. The leaves are broad ovoid, 12–18 cm (4 3⁄4–7 in) long and 7–11 cm (2 3⁄4–4 1⁄4 in) broad, always more or less glaucous on the underside, and are shallowly lobed with five to seven lobes on each side, intermediate between the chestnut oak and the white oak. In autumn, they turn brown, yellow-brown, or sometimes reddish, but generally, the color is not as reliable or as brilliant as the white oak can be. The fruit is a peduncled acorn, 1.5–2 cm (5⁄8–3⁄4 in) (rarely 2.5 cm or 0.98 in) long and 1–2 cm (3⁄8–3⁄4 in) broad, maturing about 6 months after pollination.
The swamp white oak generally occurs singly in four different forest types: black ash-American elm-red maple, silver maple-American elm, bur oak, and pin oak-sweetgum. Occasionally the swamp white oak is abundant in small areas. It is found within a very wide range of mean annual temperatures from 16 to 4 °C (61 to 39 °F). Extremes in temperature vary from 41 to −34 °C (106 to −29 °F). Average annual precipitation is from 640 to 1,270 mm (25 to 50 in). The frost-free period ranges from 210 days in the southern part of the growing area to 120 days in the northern part. The swamp white oak typically grows on hydromorphic soils. It is not found where flooding is permanent, although it is usually found in broad stream valleys, low-lying fields, and the margins of lakes, ponds, or sloughs.
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Wikipedia