Origin: in New Haven, Conn., in 1937 as a hybrid of a hardy, timber-type Chinese tree (PI 70315) with a Japanese × American hybrid. Cross made by Arthur H. Graves using a Japanese in an old planting on Long Island, N.Y., that had good resistance to chestnut blight. Graves named it in 1958 after a state park in Hamden, Conn.; released by the Connecticut Agr. Expt. Sta. in 1960. Consistent producer of large, handsome nuts (about 40 per lb) in burs that are often slightly conical. Tree: somewhat spreading; blight free. Hardy in zone 5 of Rehder, and tested in the U.S., Italy, and The Netherlands. Fruit:
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