Quercus grisea Liebmann

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Quercus grisea, commonly known as the gray oak, shin oak or scrub oak, is a North American species deciduous or evergreen shrub or medium-sized tree in the white oak group. It is native to the mountains of the southwestern United States and northern Mexico. It hybridises with four other oak species where the ranges overlap, the Arizona white oak (Q. arizonica), the Gambel oak (Q. gambelii), the Mohr oak (Q. mohriana) and the sandpaper oak (Q. pungens).

Quercus grisea may grow as a multi-stemmed shrub in drier situations but where the rainfall is sufficient, it grows into a medium size tree of up to about 20 metres (66 feet) with an irregular crown of twisted branches. The trunk is up to 60 centimetres (2 ft) in diameter with light gray bark which is fissured and cracked into small plates. The twigs are stout and a light reddish-brown, covered with grayish down. The leaves are alternate, leathery, long ovate, entire or with a few coarse teeth. They are grayish-green above and felted beneath and may fall in times of winter drought. The male catkins are yellowish-green and the female flowers are in small spikes growing in the leaf axils and appear in spring at the same time as the new leaves. The acorn cups are scaly, covered with fine hairs, and half as long as the acorns which grow singly or in pairs and are light brown.

Quercus grisea - Wikipedia

 

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