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竹叶眼子菜Potamogeton wrightii

时间:2013-10-30 17:07来源:未知 作者:徐晔春 点击:
中文名( Chinese Name ):竹叶眼子菜 学名( Scientific Name ): Potamogeton wrightii Morong 英文名( English Common Name ): 别名( Chinese Common Name ): 箬叶藻 异名( Synonym ): Potamogeton malaianus Miq. Potamogeton gaudichaudii C
中文名(Chinese Name):竹叶眼子菜
学名(Scientific Name):Potamogeton wrightii Morong
英文名(English Common Name):
别名(Chinese Common Name):箬叶藻
异名(Synonym):Potamogeton malaianus Miq.  Potamogeton gaudichaudii Cham. et Schltdl.  Potamogeton miyakozimensis Honda  Potamogeton malaianus var. latifolius Nakai ex Mori  Potamogeton tretocarpus Maxim. ex A.Benn. 
科属(Family & Genus):眼子菜科(Potamogetonaceae)眼子菜属
形态特征(Description):多年生沉水草本。根茎发达,白色,节处生有须根。茎圆柱形,直径约2毫米,不分枝或具少数分枝,节间长可达10余厘米。叶条形或条状披针形,具长柄,稀短于2厘米;叶片长5-19厘米,宽1-2.5厘米,先端钝圆而具小凸尖,基部钝圆或楔形,边缘浅波状,有细微的锯齿;中脉显著,自基部至中部发出6至多条与之平行、并在顶端连接的次级叶脉,三级叶脉清晰可见;托叶大而明显,近膜质,无色或淡绿色,与叶片离生,鞘状抱茎,长2.5-5厘米。穗状花序顶生,具花多轮,密集或稍密集;花序梗膨大,稍粗于茎,长4-7厘米;花小,被片4,绿色;雌蕊4枚,离生。果实倒卵形,长约3毫米,两侧稍扁,背部明显3脊,中脊狭翅状,侧脊锐。花果期6-10月。2n=52。
分布(Distribution):产我国南北各省区,生于灌渠、池塘、河流等静、流水体。俄罗斯、朝鲜、日本、东南亚各国及印度也有分布。
引自中国植物志英文版:FOC Vol. 23 Page 109, 112
Potamogeton wrightii Morong, Bull. Torrey Bot. Club. 13: 158. 1886.
竹叶眼子菜 zhu ye yan zi cai| Potamogetonaceae  | Potamogeton
Potamogeton intortusifolius J. B. He, L. Y. Zhou & H. Q. Wang; P. japonicus Franchet & Savatier; P. mucronatus C. Presl (1851), not Schrader ex Sonder (1850).
Plants perennial, submerged. Rhizome terete, slender. Stems simple or rarely sparsely branched, internodes elongated, terete, ca. 2 mm in diam. Stipules axillary, convolute, large and conspicuous, 2.5-5 cm, membranous, free from leaf base. Submerged leaves petiolate; petiole 1.6-14 cm; blade narrowly oblong to oblong-lanceolate, 8-20(-31) × (0.7-)1.4-2(-2.7) cm, 9-13-veined, with a conspicuous midvein, base rounded or cuneate, margin undulate and minutely denticulate, apex mucronate. Floating leaves usually absent, sometimes present, bright green, often with reddish tinge, oblong to elliptic, 5.2-12.5 × 1.2-2.5 cm, 11-25-veined, base cuneate, apex mucronate. Spikes densely flowered, with many whorls of opposite flowers; peduncles 4-7 cm, thickened upward. Carpels 4. Fruit obovoid, 2-3.3 mm, abaxial keels 3, distinct, with a narrowly winglike midvein; beak short. Fl. and fr. Jun-Oct. 2n = 52.
Lakes, rivers, channels, ponds. Anhui, Fujian, Hebei, Heilongjiang, Henan, Hubei, Hunan, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shandong, Shanxi, Sichuan, Taiwan, Xinjiang, Yunnan, Zhejiang [India, Indonesia, Japan, Kazakhstan, Korea, Laos, Malaysia, Myanmar, New Guinea, Pakistan, Philippines, Russia, Thailand, Vietnam; Pacific islands].
The species here called Potamogeton wrightii was generally treated under the name "P. malaianus," but the type specimen of P. malaianus Miquel is actually P. nodosus.




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