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Nuphar polysepala : ウィキペディア英語版 | Nuphar polysepala
''Nuphar polysepala'' (the great yellow pond-lily or wokas; syn. ''Nuphar polysepalum'' orth. err., ''Nuphar lutea'' subsp. ''polysepala'' (Engelm.) E.O.Beal) is a species of ''Nuphar'' native to western North America.〔Flora of North America: (''Nuphar polysepala'' )〕 The name Nuphar is Greek for "water-lily" and polysepala means many sepals. It is commonly found in shallow muddy ponds from northern Alaska and Yukon southward to central California and northern New Mexico, and can be recognized easily by its large floating leaves and bright yellow blossoms. == Habitat and ecology == It reproduces by both seed and rhizome. The rhizomes are underground stems that are thick and fleshy. These rhizomes are hard to pry since they are submerged in mud and are difficult to dig. The leaves float on the water surface, and have an external waxy coating which makes the leaf waterproof and thus allows the leaf stomata to breathe freely; they are glossy green, oval, 10–45 cm long and 7–30 cm wide, with a notch at one side to the leaf stem. The leaves provide shelter for fish. The rhizomes (underground stems) are round and submerged in mud.〔〔
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