《中国植物志》|| 桑科 MORACEAE ||桑组 Sect. 1. Morus ||长穗桑 Morus wittiorum Hand.-Mazz.

6.长穗桑（新拟）黔鄂桑（贵州）图版2：4-7
Morus wittiorum Hand. -Mazz. Anz. Akad.Wiss.Wien. Math.Mat.1921; et in Symb .Sin.7: 89.1929.——M. jinpingensis S. S.Chang in Acta Phytotax. Sin. 22 (1): 66. 1984.
落叶乔木或灌木，高4-12米；树皮灰白色，幼枝亮褐色，皮孔明显；冬芽卵圆形。 叶纸质，长圆形至宽椭圆形，长8-12厘米，宽5-9厘米，表面绿色，背面浅绿色，两 面无毛，或幼时叶背主脉和侧脉上生短柔毛，边缘上部具粗浅牙齿或近全缘，先端尖尾 状，基部圆形或宽楔形，基生叶脉三出，侧生2脉延长至中部以上，侧脉3-4对；叶柄 长1.5-3.5厘米，上面有浅槽；托叶狭卵形，长4毫米。花雌雄异株，穗状花序具柄； 雄花序腋生，总花梗短，雄花花被片近圆形，绿色；雌花序长9-15厘米，总花梗长2- 3厘米，雌花无梗，花被片黄绿色，覆瓦状排列，子房1室，花柱极短，柱头2裂。聚花 果狭圆筒形，长10-16厘米，核果卵圆形。花期4-5月，果期5-6月。
产湖北、湖南、广西（平南、大苗山）、广东（乐昌）、贵州东北部至南部。生于海 拔900-1400米的山坡疏林中或山脚沟边。模式标本采自湖南武冈。
韧皮纤维可以造纸或作绳索；嫩叶可以饲蚕。
我们看到了锦屏桑M. jinpingensis S. S. Chang的模式标本，对照其描述，我们认 为其形态变化仍在本种的变化范围之内，毛被的不同可能是幼态的表现，故合并于本种。

《Flora of China》|| Moraceae || Morus ||长穗桑 Morus wittiorum

6. Morus wittiorum Handel-Mazzetti, Anz. Akad. Wiss. Wien, Math.-Naturwiss. Kl. 58: 88. 1921.

长穗桑 chang sui sang

Morus jinpingensis S. S. Chang.

Trees or shrubs, 4-12 m tall, deciduous; dioecious. Bark grayish white, smooth. Branchlets pale brown, conspicuously lenticellate. Winter buds ovoid. Stipules narrowly ovate, ca. 4 mm. Petiole 1.5-3.5 cm, shallowly grooved; leaf blade oblong to broadly elliptic, 8-12 × 5-9 cm, papery, glabrous or young leaves abaxially with short soft hairs along midvein and lateral veins, abaxially pale green, adaxially green, base rounded to broadly truncate, margin subentire or toothed toward apex only, apex acuminate; basal lateral veins 3 pairs, extending to 1/2 of leaf blade length, secondary veins 3 or 4 on each side of midvein. Male catkins axillary; peduncle short. Female catkins 9-15 cm; peduncle 2-3 cm. Male flowers: calyx lobes green, ± orbicular. Female flowers: sessile; calyx lobes yellowish green, imbricate; ovary 1-loculed; style very short; stigma 2-branched. Syncarp cylindric, 10-16 cm; achenes ovoid. Fl. Apr-May, fr. May-Jun.

* Forested slopes, beside streams; 900-1400 m. Guangdong, Guangxi, Guizhou, Hubei, Hunan.

The leaves provide food for silkworms and the bark fibers are used for making textiles and paper.