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The Black-Eyed Susan (Rudbeckia hirta) has been the official Maryland flower since 1918 when it was designated the "Floral Emblem" of Maryland by the General Assembly. Black-Eyed Susans are perennial daisies or coneflowers, members of the sunflower family (Asteraceae). The flower heads measure 2 to 3 inches in diameter with yellow rays circling a dark-brown, spherical center. Commonly found in fields and on roadsides, they bloom between May and August, reaching 2 to 3 feet in height. They are native to the United States, east of the Rocky Mountains.