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宽叶楼梯草Elatostema platyphyllum

时间:2013-11-10 10:00来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ): 宽叶楼梯草 学名( Scientific Name ): Elatostema platyphyllum Wedd. 英文名( English Common Name ): 别名( Chinese Common Name ): 大叶楼梯草 异名( Synonym ): Elatostema ebracteatum W. T. Wang Elatostema e
中文名(Chinese Name):宽叶楼梯草
学名(Scientific Name):Elatostema platyphyllum Wedd.
英文名(English Common Name):
别名(Chinese Common Name):大叶楼梯草
异名(Synonym):Elatostema ebracteatum W. T. Wang  Elatostema edule C. B. Robinson  Elatostema platyphylloides B. L. Shih et Yuen P. Yang  Elatostema platyphyllum var. polycephalum Hara.
科属(Family & Genus):荨麻科(Urticaceae)楼梯草属
形态特征(Description):小灌木。茎高达1.5米,下部粗达1.5厘米,分枝,无毛,表皮有极密的小钟乳体。叶具短柄,无毛;叶片草质,斜椭圆形或斜狭椭圆形,长14-21厘米,宽6-10厘米,顶端渐尖或尾状渐尖,基部在狭侧钝或浅心形,在宽侧耳形(耳垂部分稍镰状弯曲,长1-1.4厘米),边缘在狭侧自中部或中部以上、在宽侧自下部起至顶端有小牙齿,钟乳体明显或不明显,密,长0.2-0.4毫米,三出脉、半离基或离基三出脉,侧脉每侧约3条;叶柄长2-6毫米;托叶大,披针形,长2-4厘米,顶端锐长渐尖。花序雌雄异株。雄花序具极短梗,有多数密集的花;花序托2裂,近蝴蝶形,宽约2.5厘米,边缘有少数不明显的扁卵形苞片,无毛;小苞片多数,匙状长圆形,长约2毫米,有疏睫毛。雄花有短梗,四基数。雌花序具短梗,近长方形,长约7毫米,有极多密集的花;花序梗长约5毫米;花序托二浅裂,边缘有少数扁卵形苞片,无毛;小苞片多数,匙形,长约0.7毫米,上部有柔毛。雌花:花被片极小,近条形,长约0.5毫米;子房椭圆形,与花被片近等长。花期3-4月。
分布(Distribution):产西藏、云南、四川,生于海拔800-1750米山谷林中或溪边阴处。尼泊尔、印度北部也有分布。
引自中国植物志英文版:FOC Vol. 5 Page 154   
Elatostema platyphyllum Weddell, Arch. Mus. Hist. Nat. 9: 301. 1856.
宽叶楼梯草 kuan ye lou ti cao| Urticaceae  | Elatostema
Elatostema ebracteatum W. T. Wang; E. edule C. B. Robinson; E. platyphylloides B. L. Shih & Yuen P. Yang; E. platyphyllum var. polycephalum Hara.
Subshrubs dioecious, 100-150 cm tall, glabrous. Stems erect, branched. Leaves alternate; nanophylls absent; stipules lanceolate, 2-4 × 0.2-0.8 cm, with cystoliths; petiole 2-6 mm; leaf blade obliquely elliptic or narrowly elliptic, 14-25 × 6-10 cm, herbaceous, major basal lateral veins both arising at base of leaf blade or 1 arising above base, sometimes not extending beyond middle of leaf blade, cystoliths conspicuous or obscure, dense; base with broader half auriculate (auricle 1-1.4 cm), margin denticulate, apex acuminate or caudate-acuminate. Male inflorescences solitary or in pairs, simple, 10-25 × 7-18 mm; peduncle 0.5-1 mm; receptacle nearly papilionaceous, 10-25 × 7-18 mm; bracts connate, narrowly ovate, obscure; bracteoles spatulate-oblong. Female inflorescences solitary, nearly oblong, 6-7 × 2-5 mm; peduncle ca. 5 mm; receptacle 6-7 × 2-5 mm; bracts narrowly ovate; bracteoles spatulate. Male flowers 4-merous. Fl. Mar-Oct.
Valley forests, shaded areas along streamsides; 700-1900 m. Hainan, S Sichuan, Taiwan, SE Xizang, Yunnan [Bhutan, S Japan, N India, Nepal, Philippines, Sikkim].
 
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