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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.
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.
Map of oak savanna distribution in North America. Although there are pockets of oak savanna almost anywhere in North America where oaks are present, there are three major oak savanna areas: 1) California, British Columbia, Washington and Oregon in the west; 2) Southwestern United States and northern Mexico; and 3) the prairie/forest border zone of the Midwestern United States.
Sternberg added a few other possibilities where space is limited: dwarf chinkapin oak (Quercus prinoides), 5-12 feet tall and wide, Zones 4-8; Georgia oak (Quercus georgiana), 26-50 feet tall, 15 ...
The composition and characteristics of California oak woodlands varies across the state, but are defined by three main oak species throughout coastal regions: coastal live oak, Englemann oak, and Oregon white oak. [5] [6] The concentration of each of these oak species correlates with the location of the woodland throughout California. [7]
Quercus ilicifolia, commonly known as bear oak or scrub oak, is a small shrubby oak native to the Eastern United States and, less commonly, in southeastern Canada. Its range in the United States extends from Maine to North Carolina , with reports of a few populations north of the international frontier in Ontario . [ 3 ]
The current oak–hickory forest includes the former range of the oak–chestnut forest region, which encompassed the northeast portion of the current oak–hickory range. When the American chestnut population succumbed to invasive fungal blight in the early 20th century, those forests shifted to an oak and hickory dominated ecosystem.
– Chinkapin oak – eastern, central, and southwestern US (West Texas and New Mexico), northern Mexico; Quercus ningqiangensis S.Z.Qu & W.H.Zhang – southeastern China; Quercus oblongifolia Torr. – Arizona blue oak, Southwestern blue oak, or Mexican blue oak – # southwestern U.S., northwestern Mexico; Quercus obtusata Bonpl. – Mexico