Nymphaea pedersenii
| Nymphaea pedersenii | |
|---|---|
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Order: | Nymphaeales |
| Family: | Nymphaeaceae |
| Genus: | Nymphaea |
| Species: | N. pedersenii
|
| Binomial name | |
| Nymphaea pedersenii (Wiersema) C.T.Lima & Giul.[1]
| |
| Synonyms[1] | |
| |
Nymphaea pedersenii is a species of waterlily native to Argentina, Bolivia, Brazil, and Uruguay.[1]
Description[edit]
Vegetative characteristics[edit]
Nymphaea pedersenii has ovoid to subglobose tubers.[2] The broadly elliptic leaf blade is up to 31 cm long and 22 cm wide.[3] The coriaceous blade of the floating leaves is connected to non-brittle, brownish, glabrescent, 7.1−10 mm wide petioles with a ring of trichomes at the apex. It has two primary central air and six secondary peripheral air canals.[2] The leaf venation is actinodromous.[4]
Generative characteristics[edit]
The nocturnal flowers float on the water surface.[4] The syncarpous gynoecium consists of approximately 39 carpels with clavate, cream-coloured, curved, 1.2−1.8 cm long and 2−4 mm wide appendages. The globose apex shows rosy colouration.[2] The ellipsoid, granulose, pilose seeds have trichomes arranged in continuous longitudinal lines.[4]
Cytology[edit]
The diploid chromosome count is 2n = 18.[3]
Reproduction[edit]
Vegetative reproduction[edit]
In Argentina, the main mode of reproduction relies on stolon formation.[3] Proliferating pseudanthia are absent.[2]
Generative reproduction[edit]
This species is not autogamous and outcrossing is obligatory.[3] Flowering occurs throughout the year.[2]
Taxonomy[edit]
It was first described by Wiersema in 1987 as Nymphaea amazonum subsp. pedersenii, but later it was elevated to a separate species Nymphaea pedersenii by C.T.Lima and Ana Maria Giulietti in 2021.[1]
Type specimen[edit]
The type specimen was collected by Wiersema, Vanni and Schinini in a lagoon in Itatí, Corrientes, Argentina on the 15th of April 1982.[3]
Placement within Nymphaea[edit]
It is placed in Nymphaea subgenus Hydrocallis.[3]
Etymology[edit]
The specific epithet pedersenii honours Troels Myndel Pedersen.[3]
Ecology[edit]
Habitat[edit]
In Brazil, it was observed in a stream with up to 3 m depth in the state Pará and in permanent or temporary lagoons in the Pantanal.[2] In Argentina, it was observed growing in a lagoon.[3]
Pollination[edit]
It is pollinated by the beetle species Cyclocephala mollis.[3] Beetles have been found trapped within the flowers.[2]
References[edit]
- ^ a b c d "Nymphaea pedersenii (Wiersema) C.T.Lima & Giul". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 20 December 2023.
- ^ a b c d e f g de Lima, C. T., Machado, I. C., & Giulietti, A. M. (2021). "Nymphaeaceae of Brasil." Sitientibus série Ciências Biológicas, 21.
- ^ a b c d e f g h i Wiersema, J. H. (1987). A monograph of Nymphaea subgenus Hydrocallis (Nymphaeaceae). Systematic Botany Monographs, 1-112.
- ^ a b c Pellegrini, M. O. O. & Jardim Botânico do Rio de Janeiro. (n.d.-b). Nymphaea pedersenii (Wiersema) C.T.Lima & Giul. Flora E Funga Do Brasil. Retrieved December 20, 2023, from https://floradobrasil.jbrj.gov.br/FB623374