''Nuphar submersa'' is a species of rhizomatous aquatic plant endemic to Japan.
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.
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.
Reproduction
Vegetative reproduction
''Nuphar submersa'' can reproduce clonally.
Generative reproduction
Flowering occurs from June to October.
Taxonomy
Publication
It was first described by
Takashi Shiga and
Yasuro Kadono in 2006.
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.
[Shiga, T., ISHII, J., ISAGI, Y., & KADONO, Y. (2006)]
"''Nuphar submersa'' (Nymphaeaceae), a new species from central Japan."
Acta Phytotaxonomica et Geobotanica, 57(2), 113-122.
Natural hybridisation
Together with ''
Nuphar japonica
''Nuphar japonica'', known as East Asian yellow water-lily, is a perennial, aquatic, rhizomatous, herb in the family Nymphaeaceae native to Japan, Korea, and Russia.
''Nuphar japonica'' is one of three species in the genus ''Nuphar'' that is dis ...
'' DC., it forms the natural hybrid
''Nuphar'' × ''fluminalis'' Shiga & Kadono.
[''Nuphar submersa'' , International Plant Names Index. (n.d.-b). Retrieved January 18, 2024, from https://www.ipni.org/n/77076926-1][Shiga, T., & Kadono, Y. (2007)]
"''Nuphar'' × ''fluminalis'', a new hybrid from central Japan."
Acta Phytotaxonomica et Geobotanica, 58(1), 43-50.
Etymology
The specific epithet ''submersa'', from the Latin submersa, means submerged.
[Monteiro, J. S., Gusmão, L. F. P., & Castañeda-Ruiz, R. F. (2014)]
"Two new microfungi from Brazilian Amazon Forest: ''Atrogeniculata submersa'' and ''Nigrolentilocus amazonicus''."
Mycotaxon, 127(1), 39-45.
Conservation
It is critically endangered.
[Yokogawa, M., Shiga, T., Kaneko, S., & Isagi, Y. (2012)]
"Development of nuclear microsatellite markers for the critically endangered freshwater macrophyte, ''Nuphar submersa'' (Nymphaeaceae), and cross-species amplification in six additional ''Nuphar'' taxa."
Conservation Genetics Resources, 4, 295-298.[Shiga, T., Yokogawa, M., Kaneko, S., & Isagi, Y. (2013)]
"Genetic identification of traded plants of the endangered macrophytes ''Nuphar submersa'' and ''N.'' × ''fluminalis'' (Nymphaeaceae) based on genotype data of all remnant individuals growing in the wild."
Japanese Journal of Conservation Ecology, 18(1), 33-44.[Shiga, T., Yokogawa, M., Kaneko, S., & Isagi, Y. (2017)]
"Genetic diversity and population structure of ''Nuphar submersa'' (Nymphaeaceae), a critically endangered aquatic plant endemic to Japan, and implications for its conservation."
Journal of plant research, 130(1), 83-93.
Ecology
Habitat
It occurs in rivers and streams.
References
{{Taxonbar, from=Q17253196
submersa
Flora of Japan
Endemic flora of Japan
Plants described in 2006