Flora and Fauna of the USA

The Spanish of the early sixteenth century were the first to describe the flora of the New World.Descriptive fauna of USA and ajacent islands, Lioger H.A., Harward University, 1994.Widest in the north, the continent narrows sharply at the Gulf of Mexico.South of the United States border with Mexico, it tapers gradually to the Isthmus of Panama.The Strait of Florida divides North America from the West Indies (Cuba) .Biogeographers agree that climate is the primary factor in the control of these distributions.Climate has changed under cosmic influences, such as the Milankovitch cycles.Such dynamic factors influenced the evolution of life on the North American continent.He was ignored.Nicolas Bautista Monardes (1493--1578) never saw the New World.