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Flora of North America: Quercus garryana; Oregon White Oak (Quercus garryana)—Oregon Wood Innovation Center, Oregon State University; Plants of British Columbia: Quercus garryana; Treatment from the Jepson Manual (1993)—Fagaceae Oak Family—John M. Tucker; Province of British Columbia – Ministry of Environment: "Garry Oak Ecosystems"—PDF
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.
The pre-Columbian dominant ecosystems in this region were oak savannas with woodlands and forests of oak and hickory. Today only small areas of oak and hickory woodland remain, mixed with dogwoods, sassafras trees and hop hornbeams. The ecoregion contains large areas of prairie as well as wetter meadows that are home to tulip trees and sweetgums.
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.
The commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems. [1]
Oak savanna with buttercups in Sams Valley, Oregon. Eastern woodlands of the United States - Woodlands in southeastern regions. Oak savanna - Savanna in west coast, western, and central regions. Native American use of fire - Other native uses of fire. Terra preta - Use of burning in South America agricultural use rather than grassland.
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.
Quercus nigra L. – water oak – # eastern North America; Quercus nixoniana S.Valencia & Lozada-Pérez – Mexico; Quercus pagoda Raf. – cherrybark oak – southeastern North America; Quercus palustris Münchh. – pin oak – eastern North America; Quercus panamandinaea C.H.Mull. – Panama