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Nuphar submersa
Species of perennial aquatic plant From Wikipedia, the free encyclopedia
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Nuphar submersa is a species of rhizomatous aquatic plant endemic to Japan.[1]
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Description
Vegetative characteristics
Nuphar submersa is a perennial aquatic herb with slim, branching, prostrate rhizomes. It rarely produced floating leaves. The petiolate, narrowly oblong-triangular, membranous submerged leaves with an undulate margin are 10-18 cm long, and 2-5 cm wide. The petiolate, narrowly ovate floating leaves have a cordate-saggitate base. The petioles are flattened.[2]
Generative characteristics
The 2-3 cm wide, pedunculated flowers emerge above the water surface. They have five obovate, yellow sepals, which are 1-2 cm long. The 5-7 mm long petals are spatulate. The stamens are recurved after anthesis. The gynoecium consists of many fused carpels. The red, ovoid, 2-3 cm long fruit bears numerous ovoid, 3.5-4.5 mm long, and 2.5-3.5 mm wide seeds.[2]
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Reproduction
Vegetative reproduction
Nuphar submersa can reproduce clonally.[3]
Generative reproduction
Flowering occurs from June to October.[2]
Taxonomy
Publication
It was first described by Takashi Shiga and Yasuro Kadono in 2006.[1]
Type specimen
The type species was collected by T. Shiga at an altitude of 240 m in Koshiro, Imaichi-shi, Tochigi prefecture, Japan on the 29th of September 2004.[2]
Natural hybridisation
Together with Nuphar japonica DC., it forms the natural hybrid Nuphar × fluminalis Shiga & Kadono.[4][5]
Etymology
The specific epithet submersa, from the Latin submersa, means submerged.[6]
Conservation
Ecology
Habitat
It occurs in rivers and streams.[2]
References
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