Juglans (walnut): Southwestern New York and southward to Gulf of Mexico and westward beyond Mississippi River. Cultivated in eastern middle States and southern New England, England and southern Europe.
Hicoria (hickory nut): North and middle States of North America from Atlantic to Mississippi River, and cultivated in corresponding latitude in Europe.
Hicoria (pecan nut): Southern North America. Cultivated in Prussia and England.
Order LII.—Cupuliferæ: Trees; ten genera.
Castanea (chestnut): Eastern coast of North America, west to eastern Kentucky and Tennessee. Cultivated in middle and southern England, middle and southern Europe, northern Africa, Levant, and southern and eastern Asia.
Corylus (hazelnut): Levant. Cultivated between 35° and 55° latitude in Northern Hemisphere, eastern parts of Western Hemisphere, and western Old World.
Fagus (beech): Temperate Zones up to 60° north latitude, south to 50°.
Quercus (oak): Temperate Zones above 35°, and in a zone between 30° and 60° around the globe.
Order LIII.—Salicaceæ: Shrubs, trees; numerous genera.
Salix (weeping willow): Western and southern Asia. Cultivated in southern England.