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龙桑(Morus alba var.tortuosa Hort.)为桑科桑属桑树的一个栽培变种,多年来一直作为园林观赏树种进行繁殖和栽培。 龙桑叶形较大,全缘、具光泽,小枝灰白色,较粗壮。其最大的特点为具有扭曲的枝干,树姿优美,故为园林造景的珍品。 在木本植物中,具有曲枝性状的种类尚有龙爪枣(Zizyphus jujuba var.tortuosaHort.)、龙爪柳(Salix matsudana var.tortuosa Vilm.)、龙游梅(Prunus mumevar.tortuosa T.Y.Chen et H.H.Lu)、龙须刺槐(Robinia pseudoacacia var.tortuosa DC.)等。此外,1962年作者曾在北京林学院五号楼南侧发现一株山桃(Prunus davidiana Franch.)具有曲枝性状。
Morus alba var. Tortuosa Hort. Is a cultivated variant of the mulberry tree and has been reproduced and cultivated for many years as a ornamental tree species. Long mulberry leaf shape larger, entire, with luster, branchlets gray, more robust. Its biggest feature is a twisted branches, beautiful tree pose, so landscaping treasures of the garden. Among the woody plants, the species with the characteristics of the branches are Zizyphus jujuba var. TortuosaHort., Salix matsudana var. Tortuosa Vilm., Prunus mumevar.tortuosa TY Chen et HHLu), Robinia pseudoacacia var. Tortuosa DC. In addition, in 1962, the author found a Prunus davidiana Franch. On the south side of Beijing Forestry University on the 5th floor.