Nuphar oguraensis is a species of rhizomatous aquatic plant endemic to Japan.[1]

Nuphar oguraensis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Nuphar
Species:
N. oguraensis
Binomial name
Nuphar oguraensis
Miki[1]
Nuphar oguraensis is endemic to Japan[1]
Synonyms[1]
  • Nuphar pumila subsp. oguraensis (Miki) Padgett
  • Nuphar oguraensis var. akiensis Shimoda

Description

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Vegetative characteristics

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The petiolate, green, ovate floating leaves are 7.5-11.5 cm long, and 6-9 cm wide. The petiole is 1-3 mm wide.[2] The petiole is semi-hollow.[3]

Generative characteristics

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The flowers are 1.7-2.5 cm wide. The 2.5-3 cm long, and 1.5-2 cm wide fruit bears brown, 3.5-4 mm long, and 2.5 mm wide seeds.[2]

Reproduction

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Generative reproduction

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Flowering occurs from June to October.[2]

Taxonomy

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Publication

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It was first described by Shigeru Miki in 1934.[1]

Type specimen

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The lectotype is an illustration of this species in the original publication by Shigeru Miki.[2][4]

Natural hybridisation

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It has been speculated to be of hybrid origin involving Nuphar pumila and Nuphar japonica.[2]

Conservation

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It is threatened by urbanisation and land development. It is regarded as a vulnerable species.[2]

Ecology

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Habitat

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It occurs in rivers, lakes, ponds, and ditches.[2]

References

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  1. ^ a b c d e "Nuphar oguraensis Miki". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 19 January 2024.
  2. ^ a b c d e f g Padgett, D. J. (2007). A MONOGRAPH OF NUPHAR (NYMPHAEACEAE). Rhodora, 109(937), 1–95. http://www.jstor.org/stable/23314744
  3. ^ Padgett, D. J. (2003). Phenetic studies in Nuphar Sm. (Nymphaeaceae): variation in sect. Nuphar. Plant Systematics and Evolution, 239(3/4), 187–197. http://www.jstor.org/stable/23645175
  4. ^ PADGETT, D. J. (1999). NOMENCLATURAL NOVELTIES IN NUPHAR (NYMPHAEACEAE). SIDA, Contributions to Botany, 18(3), 823–826. http://www.jstor.org/stable/41968902