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Potamogeton × griffithii
''Potamogeton'' × ''griffithii'' is a hybrid pondweed between ''Potamogeton alpinus'' and ''Potamogeton praelongus''. It occurs in oligotrophic, moderate alkalinity lakes.
==Description==
''Potamogeton'' × ''griffithii'' is a sterile hybrid pondweed between red pondweed Potamogeton alpinus and long-stalked pondweed Potamogeton praelongus. It occurs in clear, oligotrophic, low to moderate alkalinity lakes. It was discovered in 1882 in Llyn Anafon, North Wales by J.E. Griffith, a Victorian botanist, and was named after him by the noted pondweed expert Arthur Bennett.
Although intermediate in character between the parents, ''Potamogeton'' x ''griffithii'' is unlikely to be confused with either. It has long, branched stems to at least 1.7 m〔 and probably longer, growing from slender perennial rhizomes. The translucent mid to deep green leaves are typically between 120 and 240 mm long, occasionally reach 330 mm and are 10–25 mm wide and hooded at the tip.〔Preston C.D. (1995). Pondweeds of Great Britain and Ireland. BSBI Handbook No. 8. Botanical Society of the British Isles, London.〕 The leaves are sessile, sometimes slightly clasping the stem but shortly petiolate leaves may also be present. The stipules are persistent, open, colourless with a milky tinge, and opaque when dry.〔 Floating leaves may be produced and are relatively narrow, 85-105 x 13–25 mm. Turions are absent. The inflorescences are 10–20 mm long and have inconspicuous greenish flowers on robust peduncles 45–190 mm long.〔 Fruits are not produced.〔
''Potamogeton'' × ''griffithii'' is relatively easy to identify. It is larger than ''P. alpinus'', and the branching habit immediately distinguishes the two.〔 The leaf tip is also more distinctly hooded. The leaves are relatively longer than ''P. praelongus'' and ''P. perfoliatus'', and mostly do not clasp the stem. The stems are also markedly more slender than ''P. praelongus'' and do not develop the characteristic 'zigzag' pattern caused by the stem changing the angle of growth at each node.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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