Jane Yolen, a children’s author who wrote some 450 books in practically every conceivable genre, including history, how-to, science fiction and poetry, and whose immensely popular children’s books, rich in folklore and fantasy, earned her the nickname “America’s Hans Christian Andersen,” died on Thursday at her home in Hatfield, a town in western Massachusetts. She was 87. Her best known books include “Owl Moon,” a poetic picture book illustrated by John Schoenherr that won the Caldecott Medal in 1988; “The Devil’s Arithmetic” (1988), about a Jewish girl who travels back in time to the Holocaust; and the “Pit Dragon Chronicles” series, fantasy novels which appeared between 1982 and 2009.