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The leaves of the black oak are alternately arranged on the twig and are 10–20 cm (4–8 in) long with 5–7 bristle-tipped lobes separated by deep U-shaped notches. The upper surface of the leaf is a shiny deep green, and the lower is yellowish-brown.
Twig: medium-sized, fuzzy. The color can be light brown or reddish brown. Twigs have pointy and fat clusters of terminal buds. [7] Leaves: alternate, evergreen, simple, and oblong. The color is yellowish green or bluish green. Leaves are usually 1 1 ⁄ 2 to 3 1 ⁄ 2 in long. The margins are usually entire or toothed, and are rounded at the base.
Quercus macrocarpa, the bur oak or burr oak, is a species of oak tree native to eastern North America. It is in the white oak section, ... eat the leaves, twigs and bark.
The leaves and twigs. Twigs: The twigs are thick and brown or gray, hairy when young. The buds are egg-shaped with a pointed tip, angular, and hairy. In some regions, the twigs commonly bear galls. [3] Flowers: Cherrybark oak is monoecious; staminate and pistillate catkins are borne separately on the same tree. Catkins are borne on stalks from ...
The leaves and twigs can also provide browse for white-tailed deer. [6] Oak wilt can attack all red oaks, including the Shumard oak. Other diseases that attack Shumard oaks are various fungi that can grow on the leaves, powdery mildew, canker diseases, and shoestring root. [6] [failed verification]
The twigs are hairless and the buds are rounded (ovoid), brownish and pointed. [5] [6] [7] The leaves are arranged alternately along the twigs and are broadly oblong or ovate, 10–12 centimetres (4– 4 + 1 ⁄ 2 in) long by 7–8 cm (2 + 3 ⁄ 4 – 3 + 1 ⁄ 4 in) wide, with a short (typically 2–3 millimetres or 1 ⁄ 16 – 1 ⁄ 8 inch ...
The light yellow green expanding leaves turn rich dark green by the beginning of summer. The leaves are covered with minute russet hairs, especially the lower surface. The leaves are concentrated at the ends of twigs. The leaves turn brown, russet or yellow in fall and sometimes remain attached to the twigs until the following spring.
An estimated 31% of the world's oak species are threatened with extinction, while 41% of oak species are considered to be of conservation concern. The countries with the highest numbers of threatened oak species (as of 2020) are China with 36 species, Mexico with 32 species, Vietnam with 20 species, and the US with 16 species.