Nymphaea gigantea

Last updated

Giant waterlily
Nymphaea gigantea 11865986.jpg
In natural habitat in
north Queensland
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Nymphaea
Species:
N. gigantea
Binomial name
Nymphaea gigantea
Synonyms [4]
  • Castalia gigantea(Hook.) Britten
  • Leuconymphaea gigantea(Hook.) Kuntze
  • Nymphaea gigantea var. normalis Domin
  • Nymphaea gigantea var. alba Benth. & F.Muell.) K.C.Landon
  • Nymphaea gigantea f. albaBenth. & F.Muell.
  • Nymphaea gigantea f. candidaDomin
  • Nymphaea gigantea f. hudsonii(Anon.) K.C.Landon
  • Nymphaea gigantea var. hudsoniiAnon.
  • Nymphaea gigantea var. neoroseaK.C.Landon
  • Nymphaea gigantea var. roseaLovassy
  • Nymphaea gigantea var. serrataDomin
  • Victoria fitzroyana Loudon

Nymphaea gigantea, commonly known as the giant waterlily or blue waterlily, is a perennial, herbaceous plant in the family Nymphaeaceae which is native to parts of northern and eastern Australia (and possibly New Guinea), and it has been widely cultivated elsewhere. It is an aquatic plant whose natural habitat is permanent and semi-permanent still water bodies

Contents

Description

The giant waterlily has a rhizomatous growth habit - that is, the main stem of the plant grows horizontally under the ground (in this case in the mud at the bottom of a lake or pond) and only the leaves and flowers are seen above the surface. The rhizome is globose, the large floating leaves are orbicular to slightly egg-shaped, and cordate (i.e. the petiole, or leaf stem, attaches to the leaf blade at the base of a deep radial cleft). [5] [6] They measure up to 80 cm (31 in) diameter and are glabrous (hairless) on both sides, with regularly-spaced teeth along the margins measuring about 5 mm (0.20 in) long. [5] [6]

The large flowers are solitary and up to 25 cm (9.8 in) diameter. They are held on a rigid, upright peduncle that may extend up to 50 cm (20 in) above the water surface. [5] [6] They have four green sepals that measure about 11 cm (4.3 in) long and sometimes have blue or purple streaks, and up to 32 petals that are initially lilac or blue but fade to almost white with age. [5] [6]

The fruit is – in botanical terms – a berry. After fertilisation of the flower it is drawn underwater by the contraction of the peduncle (i.e. the flower stalk), [7] where the fruit ripens just below the surface. [8] They are roughly the size of an apple and may contain up to 3,000 seeds. [8]

Phenology

Flowering occurs throughout the year, but is more common in warmer months. The flowers are open during the day and closed at night. [5]

Cytology

The chromosome count is n = 112. The genome size is 2709.06 Mb. [9]

Taxonomy

Nymphaea gigantea was first described in 1852 by the English botanist and illustrator William Jackson Hooker in The Botanical Magazine, based on material collected by John Carne Bidwill from the Wide Bay area of Queensland (at that time still a part of the colony of New South Wales). The description was accompanied by an illustration by Walter Hood Fitch detailing the flower. [3] [10] [11]

Distribution and habitat

The range of the giant waterlily in Australia is from northeastern New South Wales, through eastern and northern Queensland, northern parts of the Northern Territory, and the far northeast of Western Australia. [4] [6] [12] [13] Some non-authoritative sources claim it is also native to New Guinea. [14] [15]

The habitat is permanent and semi-permanent waters of lakes, billabongs, and sluggish rivers where the bottom is deep mud and the water depth is at least 1.5 m (4 ft 11 in). [6] [14] [16] : 109 

Conservation

This species is listed by the Queensland Department of Environment and Science as "special least concern", a rating unique to Queensland which is ranked above "least concern". [1] [2] As of 6 July 2023, this species has not been assessed by the International Union for Conservation of Nature (IUCN).

Cultivation

The species was brought to England by Frederick Strange, where it received notices in newspapers and began to be cultivated by nurseries. [11]

Uses

Various parts of Nymphaea gigantea are edible and the plant was an important staple food for indigenous Australians across the northern parts of Australia. [14] [16] : 226  The golfball-sized tubers were collected from the muddy bottoms of water bodies by indigenous women and roasted before eating. [8] [14] [16] : 226  The flower buds and peeled stalks were eaten raw, and the seeds could either be eaten on their own after roasting the whole fruit, or were pounded to make a flour for damper. [8] [14] [16] : 109  [16] : 226 

Related Research Articles

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<i>Mucuna gigantea</i> Species of plant in the family Fabaceae

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References

  1. 1 2 "Species profile—Nymphaea gigantea". Queensland Department of Environment and Science. Queensland Government. 2022. Retrieved 26 June 2023.
  2. 1 2 "Nature Conservation Act 1992". Queensland Legislation. Queensland Government. 2023. Retrieved 5 July 2023.
  3. 1 2 "Nymphaea gigantea". Australian Plant Name Index (APNI). Centre for Australian National Biodiversity Research, Australian Government . Retrieved 26 June 2023.
  4. 1 2 3 "Nymphaea gigantea Hook". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 26 June 2023.
  5. 1 2 3 4 5 "Nymphaea gigantea". Flora of Australia . Australian Biological Resources Study, Department of Climate Change, the Environment and Water: Canberra. 2022. Retrieved 29 June 2023.
  6. 1 2 3 4 5 6 "PlantNET - FloraOnline". PlantNET (The NSW Plant Information Network System). Royal Botanic Gardens and Domain Trust, Sydney. Retrieved 29 June 2023.
  7. ↑ "PlantNET - FloraOnline". PlantNET (The NSW Plant Information Network System). Royal Botanic Gardens and Domain Trust, Sydney. Retrieved 2 July 2023.
  8. 1 2 3 4 Low, Tim (1998). Wild Food Plants of Australia. Sydney: Angus & Robertson Publishers. p. 56. ISBN   0-207-16930-6.
  9. ↑ Chen, Fei; Liu, Xing; Yu, Cuiwei; Chen, Yuchu; Tang, Haibao; Zhang, Liangsheng (2017). "Water lilies as emerging models for Darwin's abominable mystery" (PDF). Horticulture Research. 4: 17051. doi:10.1038/hortres.2017.51. PMC   5626932 . PMID   28979789. S2CID   1295747.
  10. ↑ Hooker, William Jackson (1852). Illustrated by Walter Hood Fitch. "Tab 4647 Nymphaea gigantea". Curtis's Botanical Magazine. 78.
  11. 1 2 Whittell, H. M. (1947). "Frederick Strange". The Australian Zoologist. 11: 96–114.
  12. ↑ "Search: species: Nymphaea gigantea | Occurrence records". Australasian Virtual Herbarium . Australian Government . Retrieved 5 July 2023.
  13. ↑ "Nymphaea gigantea". Global Biodiversity Information Facility. Retrieved 6 July 2023.
  14. 1 2 3 4 5 Beasley, John (2009). Plants of Cape York - the compact guide. John Beasley. p. 222. ISBN   978-0-9806863-0-2.
  15. ↑ Mills, Colin. "Nymphaea gigantea Hook". Hortus Camdenensis. Colin Mills. Retrieved 6 July 2023.
  16. 1 2 3 4 5 Isaacs, Jennifer (1987). Bush Food - Aboriginal Food and Herbal Medicine. Sydney: Lansdowne Publishing. ISBN   0725408340.
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