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''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.〔(Biota of North America Program 2014 county distribution map )〕 Common in the United States, it is listed as an endangered species in Canada,〔Flora of North America: (''Morus rubra'' )〕〔Ambrose, J. D., & Kirk, D. (2004). National Recovery Strategy for Red Mulberry (Morus rubra L.). Ontario Ministry of Natural Resources, Guelph, Ontario, Canada〕 and is susceptible to hybridization with the invasive white mulberry (''M. alba''), introduced from Asia.〔Burgess, K. S., Morgan, M., Deverno, L., & Husband, B. C. (2005). Asymmetrical introgression between two ''Morus'' species (''M. alba, M. rubra'') that differ in abundance. ''Molec. Ecol.'' 14: 3471–3483 (University of Toronto, Barrett Lab ).〕 ==Characteristics== Red mulberry is a deciduous tree, growing to 10–15 m tall, rarely 20 m, with a trunk up to 50 cm diameter. The leaves are alternate, 7–14 cm long and 6–12 cm broad, 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.〔 The upper surface of the leaves is noticeably rough, similar in texture to fine sandpaper, and unlike the lustrous upper surface of the leaves of white mulberry (''M. alba'').〔Farrar, J.L. (1995). Trees in Canada. Fitzhenry and Whiteside/Canadian Forest Service, Markham, Ontario.〕 The underside of the leaves is covered with soft hairs. The leaf petiole exudes milky sap when severed.〔(Trees of Alabama and the Southeast: Red Mulberry, ''Morus rubra'', Moraceae. )〕 Red mulberry is hardy to subzero temperatures, relatively hardy to drought, pollution, and poor soil, though the white mulberry is hardier.〔(California Rare Fruit Growers )〕 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, 2–3 cm long, when it is ripening it is red or dark purple, edible and very sweet with a good flavor.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Morus rubra」の詳細全文を読む スポンサード リンク
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