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Nuphar variegata
Species of aquatic plant From Wikipedia, the free encyclopedia
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Nuphar variegata (variegated pond-lily, bullhead pond-lily or yellow pond-lily[3]) is rhizomatous, perennial, aquatic[4] herb[5] in the water lily family Nymphaeaceae native to much of Canada and the northernmost of the United States.[6][7]
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Description
Upper and lower surface of Nuphar variegata leaf
Vegetative characteristics
Nuphar variegata is a rhizomatous, perennial, aquatic[4] herb[5] with 2.5–7 cm wide rhizomes.[6] The leaves are submerged or floating, but most are floating leaves.[8][6] The submerged leaves are 7–35 cm long, and 5–25 cm wide.[9] The petiole is flattened.[10][11][6]
Generative characteristics
The 2.5–5 cm wide,[6] yellow flowers float on the water surface or extend beyond it.[12] The flowers have 6 yellow sepals[11] which enclose the small petals.[13] The gynoecium consists of 7–28 carpels.[6] The green to yellow,[13][11] or rarely red stigmatic disk with 7–28 stigmatic rays is 8–20 mm wide.[6] The fleshy,[9] strongly ribbed,[14] ovoid, 2–4.3 cm long, and 2–3.5 cm wide fruit bears 2.5-5 mm long seeds.[6]
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Cytology
The chromosome count is 2n = 34.[6]
Taxonomy
It was first validly published by Elias Durand in 1866 based on previous work by George Engelmann.[5][2] It is placed in the section Nuphar sect. Astylus.[5][7]
Natural hybridisation
Together with Nuphar microphylla, it forms the natural hybrid Nuphar × rubrodisca.[9][6][15]
Etymology
The specific epithet variegata, from the Latin variegatus, means variously coloured.[16]
Conservation
The NatureServe conservation status is T5 Secure.[1]
Ecology
Habitat
It occurs in ponds, lakes, streams, and rivers[8] in up to 2 m deep water.[11]
References
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