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Nymphaea immutabilis
Species of water lily From Wikipedia, the free encyclopedia
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Nymphaea immutabilis (black-soil waterlily) is a species of waterlily native to the far north of Western Australia, the Northern Territory, and northern and eastern Queensland, Australia.[3][2]
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Description
Vegetative characteristics
Nymphaea immutabilis is an annual or perennial plant with globose rhizomes.[4] The round, 70 cm wide leaves have dentate margins.[5][4]
Generative characteristics
The flowers are up to 30 cm in diameter, on pedicels or stalks up to 5 m long;[6] the outer petals are blue, grading to white inner petals.[7] The flowers extend up to 50 cm above the water surface.[5] The flowers have four sepals, and 34 petals. The androecium consists of 400 stamens. The gynoecium consists of 9-20 carpels.[4] The globose, 5 cm wide fruit bears numerous 4 mm long, and 2.5 mm wide, rounded seeds with trichomes arranged in irregular rows.[5] The immature seeds are red, but mature to brownish-grey.[8] The seeds have a mechanism of physiological dormancy.[9]
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Cytology
The chromosome count is n = 42. The genome size is 1408.32 Mb.[10]
Reproduction
Generative reproduction
Taxonomy
Publication
It was first described by Surrey Wilfrid Laurance Jacobs in 1992.[2]
Type specimen
The type specimen was collected by S. Jacobs and J. Clarkson near Mareeba, Queensland, Australia on the 26th of July 1987.[4]
Placement within Nymphaea
It is placed in Nymphaea subgenus Anecphya.[9]
Separation of Nymphaea kimberleyensis
The subspecies Nymphaea immutabilis subsp. kimberleyensis S.W.L.Jacobs was described in 1992. Later in 2011, it was elevated to a separate species Nymphaea kimberleyensis (S.W.L.Jacobs) S.W.L.Jacobs & Hellq.[11][12]
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Etymology
The specific epithet immutabilis, meaning unchanging, references the floral colouration, which does not change as the flower ages.[4]
Conservation
The NCA status of Nymphaea immutabilis is Special Least Concern (SL).[1] In the Northern Territory it is categorised as vulnerable.[13][14]
Ecology
Habitat
It occurs in swamps,[9] permanent, or temporary waters,[4] billabongs, streams, and rivers.[8]
References
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