| Nuphar saikokuensis | |
|---|---|
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Order: | Nymphaeales |
| Family: | Nymphaeaceae |
| Genus: | Nuphar |
| Section: | Nuphar sect. Nuphar |
| Species: | N. saikokuensis |
| Binomial name | |
| Nuphar saikokuensis Shiga & Kadono [1] | |
 | |
| Nuphar saikokuensis is endemic to Japan [1] | |
Nuphar saikokuensis is a species of rhizomatous aquatic plant endemic to Japan. [1]
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. [2]
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. [2]
Flowering occurs from June to October. Despite likely being of hybrid origin, it is fertile. [2]
It was first described by Takashi Shiga and Yasuro Kadono in 2015. [1]
The type specimen was collected by T. Shiga in Oda-cho, Ono-shi, Hyogo prefecture, Japan on the 30th of May 2001. [2]
It is likely a natural hybrid of Nuphar japonica with Nuphar subintegerrima , or Nuphar oguraensis . It is possible, that all three species are involved. [2]
The specific epithet saikokuensis is derived from the Japanese regional name "Saikoku", meaning Western Japan, to which this species is native to. [2]
It is threatened by extinction, and several populations have already gone extinct. [2]
It occurs in ponds, rivers, lakes, and streams. [2]
Nuphar is a genus of aquatic plants in the family Nymphaeaceae, with a temperate to subarctic Northern Hemisphere distribution. Common names include water-lily, pond-lily, alligator-bonnet or bonnet lily, and spatterdock.
Echinodorus cordifolius, the spade-leaf sword or creeping burhead, is a species of aquatic plants in the Alismatales. It is native to Mexico, the West Indies, Central America, South America and the southeastern United States.
Nepenthes rigidifolia is a critically endangered tropical pitcher plant endemic to Sumatra, where it grows at elevations of 1000–1600 m above sea level.
Nuphar lutea, the yellow water-lily, brandy-bottle, or spadderdock, is an aquatic plant of the family Nymphaeaceae, native to northern temperate and some subtropical regions of Europe, northwest Africa, and western Asia. This species was used as a food source and in medicinal practices from prehistoric times with potential research and medical applications going forward.
Nymphoides peltata is perennial, rooted aquatic plant with floating leaves of the family Menyanthaceae.
Cryptocoryne beckettii, also known as Beckett's water trumpet, is a plant species belonging to the Araceae genus Cryptocoryne.
Potamogeton natans, commonly known as broad-leaved pondweed, floating pondweed, or floating-leaf pondweed, is an aquatic species in the genus Potamogeton native to quiet or slow-flowing freshwater habitats throughout the Holarctic Kingdom.
Nuphar polysepala, also known as the great yellow pond-lily, wokas, or wocus, is a species of Nuphar native to western North America. 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.
Eleocharis confervoides is a species of plant in the sedge family (Cyperaceae). It is a perennial, submerged, aquatic and deeply rooted herb. It is known by its common name Algal bulrush and has lots of synonyms. The species has worldwide but very spotty distribution and is native in many tropical and subtropical regions in America, Asia and Africa. It inhabits in water, usually in shallow or deep lakes and ponds. The plant has slender stem with many branches, the leaves float in the water and flowers are usually emergent over the water surface. Fruiting occurs in fall. The most occurrences of plant appear in April and frequency of occurrences is increasing the last years
Nuphar microphylla is a perennial, rhizomatous, aquatic herb found in North America. It is listed as a special concern and believed extirpated in Connecticut.
Nuphar subintegerrima is a species of rhizomatous aquatic plant endemic to Japan.
Nymphaea loriana is a species of waterlily endemic to Manitoba, and Saskatchewan, Canada.
Nuphar ulvacea is a species of rhizomatous aquatic plant native to the US-American states Alabama and Florida.
Nuphar submersa is a species of rhizomatous aquatic plant endemic to Japan.
Nuphar orbiculata is a species of rhizomatous aquatic plant native to the US-American states Alabama, Florida, and Georgia.
Nuphar oguraensis is a species of rhizomatous aquatic plant endemic to Japan.
Nuphar × rubrodisca is a species of rhizomatous aquatic plant native to Canada and the USA. It is a natural hybrid of Nuphar variegata and Nuphar microphylla.
Nuphar × fluminalis is a species of rhizomatous aquatic plant endemic to Japan. It is a natural hybrid of Nuphar japonica and Nuphar submersa.
Nuphar pumila subsp. sinensis is a subspecies of Nuphar pumila native to China.
Nuphar sect. Nuphar is a section within the genus Nuphar native to Eurasia, in addition to a single north American species Nuphar microphylla.