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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.
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 myrtifolia, the myrtle oak, [3] is a North American species of oak. It is native to the southeastern United States (Mississippi, Alabama, Florida, Georgia, South Carolina). It is often found in coastal areas on sandy soils. [4] It is an evergreen tree that can reach 12 meters (39 feet) tall, also appearing as a shrub in drier sites.
– 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
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 ]
This leads to a lack of oak seedings and saplings to grow and replace mature oaks (Quercus spp.) once they die and growth in abundance of new species. Deer browse is also a large threat to the plant community as white-tailed deer (Odocoileus virginianus) use oak seedlings for consumption at growing rates with increasing population sizes. [6]
Let me note first that Linnaeus’ major scientific contribution was the binomial (two names) system whereby each class of plants and animals is awarded a genus name followed by a species, both in ...
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.