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Nymphaea immutabilis

Species of water lily From Wikipedia, the free encyclopedia

Nymphaea immutabilis
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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]

Quick Facts Conservation status, Scientific classification ...
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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

Flowering occurs from March to November.[5][4]

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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