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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Potamogeton praelongus ： ウィキペディア英語版 Potamogeton praelongus ''Potamogeton praelongus'', commonly known as whitestem pondweed in North America and Long-stalked Pondweed in Britain, is a large, perennial aquatic plant in the family Potamogetonaceae. It is widely distributed in lakes and rivers in the northern hemisphere, but is sensitive to poor water quality. ==Description== Long-stalked pondweed has tall stems to 3 m growing from stout, rusty-spotted perennial rhizomes.〔 The stems often change direction between each node, giving a characteristic zig-zagging pattern. The transparent pale to deep green leaves〔〔 are typically between 60 and 150 mm long but occasionally reach 250 mm〔 and are 14–40 mm wide.〔 The stipules are persistent, open, whitish and translucent, with prominent veins when dry.〔 Floating leaves and turions are absent.〔 The inflorescences are produced quite early for a pondweed, in May–June, and have 15-20 inconspicuous greenish flowers and held on robust peduncles 80–200 mm long.〔 The fruits are large for a pondweed, 4.5-5.5 x 2.5-3.6 mm.〔 Hybrids with several other species, ''P. alpinus'' (''P''. × ''griffithii'' A. Benn.), ''P. crispus'' (''P''. × ''undulatus'' Wolgf.), ''P. lucens'' (''P''. × ''jutlandicus'' Zalewska-Gał.), ''P. natans'' (''P''. × ''vepsicus'' A.A. Bobrov & Chemeris) and ''P. perfoliatus'' (''P''. × ''cognatus'' Asch. & Graebn.) have been described, but all are rare.〔〔〔 Chromosome counts〔 show that, like most other broad-leaved pondweeds, ''P. praelongus'' is tetraploid, with 2n=52 chromosomes. Long-stalked pondweed is relatively easy to identify. It could be confused with narrow-leaved forms of ''Potamogeton perfoliatus'', but the persistent stipules, leaves only partially clasping the stem, larger fruits and (usually) zigzag pattern of the stem are distinctive. Hybrids may be more difficult to identify but usually show various features of the other parent. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potamogeton praelongus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.