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Quercus nigra, the water oak, is an oak in the red oak group (Quercus sect. Lobatae), native to the eastern and south-central United States, found in all the coastal states from New Jersey to Texas, and inland as far as Oklahoma, Kentucky, and southern Missouri. [3] It occurs in lowlands and up to 450 meters (1,480 feet) in elevation.
The genus Quercus contains about 500 known species, plus about 180 hybrids between them. [1] The genus, as is the case with many large genera, is divided into subgenera and sections. Traditionally, the genus Quercus was divided into the two subgenera Cyclobalanopsis, the ring-cupped oaks, and Quercus, which included
Quercus ilicifolia is a deciduous tree or shrub growing occasionally reaching a height of 6 meters (20 feet) but usually much smaller. [4] [5] It is gangly and can form a dense thicket. The plant grows from a large taproot, which reach 20 centimeters (8 inches) in thickness. The taproot lives a long time, producing several generations of above ...
Quercus hemisphaerica is a medium-sized evergreen to semi-evergreen tree which can grow as tall as 35 meters (115 feet) with a trunk diameter of 1.5 m (5 ft), although it is more commonly around 18–20 m (59–66 ft) tall.
Native ash species, including white ash (pictured), have been declining rapidly this century due to predation by the emerald ash borer. [1]Silvics of North America (1991), [2] [3] a forest inventory compiled and published by the United States Forest Service, includes many hardwood trees.
Quercus rubra, the northern red oak, is an oak tree in the red oak group (Quercus section Lobatae). It is a native of North America, in the eastern and central United States and southeast and south-central Canada. It has been introduced to small areas in Western Europe, where it can frequently be seen cultivated in gardens and parks.
Quercus fusiformis is an evergreen tree in the southern live oaks section of the genus Quercus (section Virentes). [6] It is distinguished from Quercus virginiana (southern live oak) most easily by the acorns, which are slightly larger and with a more pointed apex.
Quercus laurifolia is a tree growing to 20–24 meters (65–80 feet) (rarely to 40 m or 130 ft) tall, with a large, circular crown. The leaves are broad lanceolate, 2.5–12.7 centimeters (1–5 inches) long and 1.3–4.4 cm (1 ⁄ 2 – 1 + 3 ⁄ 4 in) broad, and unlobed (very rarely three-lobed) with an entire margin and a bristle tip; they typically fall just as the new leaves start to ...