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光叶桑Morus macroura

TAG标签: 桑科 Moraceae 桑属 Morus
时间:2013-10-17 16:49来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):光叶桑 学名( Scientific Name ): Morus macroura Miq. 英文名( English Common Name ): 别名( Chinese Common Name ): 奶桑 异名( Synonym ): Morus wallichiana Koidz. Morus laevigata Wall. ex Brandis Morus alb
中文名(Chinese Name):光叶桑
学名(Scientific Name):Morus macroura Miq.  
英文名(English Common Name):
别名(Chinese Common Name):奶桑
异名(Synonym):Morus wallichiana Koidz.  Morus laevigata Wall. ex Brandis  Morus alba var. laevigata Wall. ex Bureau  Morus wittiorum var. mawu Koidz.  Morus macronra var. mawu (Koidznmi) C. Y. Wu et Z. Y. Cao
科属(Family & Genus):桑科(Moraceae)桑属
形态特征(Description):小乔木,高7-12米,胸径10-20厘米;小枝幼时被柔毛;冬芽卵状椭圆形或卵圆形,被白色柔毛。叶膜质,卵形或宽卵形,长5-15厘米,宽5-9厘米,先端渐尖至尾尖,尾长1.5-2.5厘米,基部圆形至浅心形或平截,边缘具细密锯齿,表面深绿色,略粗糙,侧脉及网脉疏生细毛,背面浅绿色,幼时脉上疏被细毛,基生侧脉延长至叶片中部,侧脉4-6对,向上斜展;叶柄长2-4厘米;托叶细小,早落。花雌雄异株;雄花序穗状,单生或成对腋生,长4-8厘米,总花梗长1-1.5厘米;雄花具梗,花被片4,卵形,外面被毛,雄蕊4枚,花丝长约2.5毫米,花药近球形,退化雌蕊方形;雌花序狭圆筒形,长6-12厘米,总花梗与雄花总梗相等;雌花花被片4,被毛,子房斜卵圆形,稍扁,微被毛,无花柱,柱头2裂,内面有乳头状突起。聚花果成熟时黄白色;小核果,卵球形,微扁。花期3-4月,果期4-5月。
分布(Distribution):产云南、西藏等地,生于海拔300-2200米山谷或沟边热带林中向阳地区。东南亚等地也有。
用途(Use):树皮可以造纸;木材及叶可以提取桑色素。
引自中国植物志英文版:FOC Vol. 5 Page 25
Morus macroura Miquel, Pl. Jungh. 1: 42. 1851.
奶桑 nai sang | Moraceae  | Morus
Morus alba Linnaeus var. laevigata Wallich ex Bureau; M. laevigata Wallich ex Brandis; M. macroura var. mawu (Koidzumi) C. Y. Wu & Z. Y. Cao; M. wallichiana Koidzumi; M. wittiorum Handel-Mazzetti var. mawu Koidzumi.
Trees 7-12 m tall, d.b.h. 10-20 cm; dioecious. Branchlets pubescent when young. Winter buds ovoid-ellipsoid to ovoid, white pubescent. Stipules small. Petiole 2-4 cm; leaf blade ovate to broadly ovate, 5-15 × 5-9 cm, membranous, abaxially pale green and with short soft hairs along midvein and lateral veins when young, adaxially dark green and with soft hairs along veins, base rounded, ± cordate, or truncate, margin minutely and densely serrate, apex acuminate to shortly acuminate; secondary veins 4-6 on each side of midvein. Male catkins axillary, paired, 4-8 cm; peduncle 1-1.5 cm. Female inflorescences cylindric, 6-12 cm; peduncle 1-1.5 cm. Male flowers: calyx lobes ovate, adaxially pubescent; filament ca. 2.5 mm; anther globose. Female flowers: calyx lobes pubescent; ovary ovoid, declinate, ± compressed, pubescent; style absent; stigma 2-branched, papillate. Syncarp yellowish white when mature, 6-12 cm; achenes ovoid. Fl. Mar-Apr, fr. Apr-May.
Mountain forests, tropical forests; (300-)1000-1300(-2200) m. E Xizang, S Yunnan [Bhutan, Indochina, Malaysia, Myanmar, Sikkim, Thailand].
This species is used for paper making and the wood and leaves are used in dyeing.


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