Morus rubra, commonly known as the red mulberry, is a species of mulberry native to eastern and central North America. It is found from Ontario, Minnesota, and Vermont south to southern Florida, and west as far as southeastern South Dakota, Nebraska, Kansas, and central Texas. There have been reports of isolated populations (very likely naturalized) in New Mexico, Idaho, and British Columbia. Common in the United States, it is listed as an endangered species in Canada, and is susceptible to hybridization with the invasive white mulberry (M. alba), introduced from Asia. Description Red mulberry is a small to medium-sized deciduous tree, growing to tall, rarely , with a trunk up to in diameter. It can live up to 125 years. The leaves are alternate, long (rarely to ) and broad (about twice as big as the white mulberry's leaves), simple, broadly cordate, with a shallow notch at the base, typically unlobed on mature trees although often with 2–3 lobes, particularly on young trees, and with a finely serrated margin. Unlike the leaves of white mulberry (M. alba) which have a lustrous upper surface, the red mulberry leaf upper surface is noticeably rough, similar in texture to fine sandpaper, and the underside is densely covered with soft hairs. The leaf petiole exudes milky sap when severed. The leaves turn yellow in autumn. The flowers are relatively inconspicuous: small, yellowish green or reddish green and opening as leaves emerge. Male and female flowers are usually on separate trees although they may occur on the same tree. The fruit is a compound cluster of several small achenes surrounded by a fleshy calyx, similar in appearance to a blackberry, long. It is initially pale green, ripening to red or dark purple. The red mulberry develops an extensive root system, containing lateral, horizontal roots that remain within the upper 24 inches of the soil and smaller, vertical roots that go off the lateral roots. This combination gives stability and allows the tree to uptake the nutrients from the soil surface where nutrients are most abundant.. Red mulberry is hardy to subzero temperatures, relatively hardy to drought, pollution, and poor soil, though the white mulberry is hardier. The berries are widely sought after by birds in spring and early summer in North America; as many as 31 species of birds have been recorded visiting a fruiting tree in Arkansas. The Red Mulberry is pollinated by the