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Nuphar saikokuensis

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Species of perennial aquatic plant

Nuphar saikokuensis
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Nuphar
Species: N. saikokuensis
Binomial name
Nuphar saikokuensis
Shiga & Kadono
Nuphar saikokuensis is endemic to Japan

Nuphar saikokuensis is a species of rhizomatous aquatic plant endemic to Japan.

Description

Vegetative characteristics

Nuphar saikokuensis is an aquatic perennial herb with prostrate, branching rhizomes. The leaves are submerged, floating, or emergent. The petiolate, ovate floating or emergent leaves with a cordate base and an obtuse apex are 10–30 cm long, and 7–20 cm wide. The adaxial leaf surface is glabrous, and the abaxial leaf surface is pubescent. The membranous, ovate to round submerged leaves with an undulate margin are 7–30 cm long, and 5–20 cm wide. The petioles are flattened to terete.

Generative characteristics

The yellow, protogynous, pedunculate, 3–4 cm wide flowers are raised above the water surface. The five subcoriaceous, obovate to orbicular sepals are 1.5–2.5 cm long. The petals are 5–8 mm long. The androecium consists of numerous stamens with 4–6 mm long anthers. The gynoecium consists of numerous fused carpels. The yellow, 4–11 mm wide stigmatic disk has 5–17 stigmatic rays, which are 2.5–4 mm long. The ovoid, green, 2.5–4 cm long, and 1.5–3 cm wide fruit bears many ovoid, 3.5–5 mm long, and 3–4.5 mm wide seeds.

Reproduction

Generative reproduction

Flowering occurs from June to October. Despite likely being of hybrid origin, it is fertile.

Taxonomy

Publication

It was first described by Takashi Shiga and Yasuro Kadono in 2015.

Type specimen

The type specimen was collected by T. Shiga in Oda-cho, Ono-shi, Hyogo prefecture, Japan on the 30th of May 2001.

Natural hybridisation

It is likely a natural hybrid of Nuphar japonica with Nuphar subintegerrima, or Nuphar oguraensis. It is possible, that all three species are involved.

Etymology

The specific epithet saikokuensis is derived from the Japanese regional name "Saikoku", meaning Western Japan, to which this species is native to.

Conservation

It is threatened by extinction, and several populations have already gone extinct.

Ecology

Habitat

It occurs in ponds, rivers, lakes, and streams.

References

  1. ^ "Nuphar saikokuensis Shiga & Kadono". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 January 2024.
  2. ^ Shiga, T., & Kadono, Y. (2015). "Nuphar saikokuensis (Nymphaeaceae), a new species from central to western Japan." Journal of Japanese Botany, 90(1), 22-28.
Taxon identifiers
Nuphar saikokuensis
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