Humid Subtropical North America

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CFA and CWA Climate Regions of North America

Humid Subtropical North America, a region within Trewartha Climate code, "Cfa", is a Gulf type, warm, temperate, eastern margin, climate biome that roughly covers the North American "South" or "Southeast" and small portions of eastern Mexico. This includes eastern Oklahoma, east Texas, Louisiana, Arkansas, the southern perimeter of Missouri, Mississippi, Tennessee, Kentucky, Alabama, Georgia, South Carolina, North Carolina, Virginia, east Maryland, Delaware, south New Jersey, most of Florida, as well as some high altitude regions in eastern Mexico, primarily on the eastern slopes of the Sierra Madre Oriental. Many other regions of the world have humid subtropical climates, with closely relative plant species.

Part of the goal of this network is to:

1. Cooperate between institutions that preserve native, naturalized and cultivated crops of humid subtropical North America, as well as rare or endangered varieties of other Cfa classified zones, worldwide;

2. Collect resources to store the seeds at 4°C and select from decennial plant growouts in various hardiness zones 7, 8 and 9, thereby adapting them to various climates and soils, increasing their genetic diversity.