Nymphaeales

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Nymphaeales
Temporal range: 130–0  Ma
Trithuria submersa - Flickr - Kevin Thiele.jpg
Trithuria submersa
Barclaya longifolia in Thailand crooped.jpg
Barclaya longifolia
Euryale ferox kz06.jpg
Euryale ferox
Glechiki zhovti, latattia zhovte abo kubishka zhovta (Nuphar lutea) 18.jpg
Nuphar lutea
Wild populations of Victoria boliviana sp. nov. (Bolivia, Beni).jpg
Victoria boliviana
Brasenia schreberi inat1.jpg
Brasenia schreberi
Huang Ju Hua Cao Cabomba aquatica -Bin Cheng Zhi Wu Yuan Penang Botanic Garden- (9213351473).jpg
Cabomba aquatica
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Salisb. ex Bercht. & J.Presl [1]
Families [2]

Cabombaceae Rich. ex A.Rich.
Hydatellaceae U.Hamann
Nymphaeaceae Salisb.

Contents

Synonyms [3]
List
  • Barclayales Doweld
  • Cabombales Richard
  • Euryalales H. L. Li
  • Hydatellales Reveal & Doweld
  • Hydropeltidales Spenner
  • Hydatellanae Reveal
  • Nymphaeanae Reveal
  • Hydatellidae Doweld
  • Nymphaeidae Takhtajan
  • Hydropeltopsida Bartling
  • Nymphaeopsida Horaninow

The Nymphaeales are an order of flowering plants, consisting of three families of aquatic plants, the Hydatellaceae, the Cabombaceae, and the Nymphaeaceae (water lilies). It is one of the three orders of basal angiosperms, an early-diverging grade of flowering plants. At least 10 morphological characters unite the Nymphaeales. [3] One of the traits is the absence of a vascular cambium, which is required to produce both xylem (wood) and phloem, which therefore are missing. [4] Molecular synapomorphies are also known.

The Plant List, created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden recognizes about 70 species in 11 genera within the order, [5] but a phylogenetic study of the genus Nymphaea implies that the number of species could be more than 90. [6] The difference in species numbers is due almost entirely to the difficulty of delineating species in the genus Nymphaea.

All of the species are rhizomatous aquatic herbs with a broad leaf base and large, showy flowers.

Fossils

The fossil record consists especially of seeds, but also pollen, stems, leaves, and flowers. It extends back to the Cretaceous. [7] [8] The crown group of the Nymphaeales has been estimated to be about 112 million years old. [9] Some have suggested that this age might be too old. [10]

A basal member of Nymphaeales, Monetianthus , is known from Early Cretaceous Portugal. [11] A fossil member of the Nympheaceae is Jaguariba from the Early Cretaceous of Brazil. Several Cretaceous-age Cabombaceae genera are also known, including Scutifolium from Jordan, Pluricarpellatia from Brazil, and Brasenites from Kansas. [12] The fossil genus Notonuphar , thought to be a close relative of the modern Nuphar , is known from Eocene-aged sediments from Seymour Island, Antarctica. [13] The aquatic plant fossil Archaefructus from the Early Cretaceous of Liaoning, China possibly also belongs to this group. [14]

Classification

The Nymphaeales currently include three families and about 70 to 90 species.

order Nymphaeales
Cabombaceae
Hydatellaceae
Nymphaeaceae
Angiosperms

Amborella

Nymphaeales

Hydatellaceae

Cabombaceae

Nymphaeaceae

Austrobaileyales

magnoliids

Chloranthales

monocots

Ceratophyllum

eudicots

The classification of Nymphaeales and phylogeny within the flowering plants, as of APG III (2009).

This order was not part of the APG II system's 2003 plant classification (unchanged from the APG system of 1998), which instead had a broadly circumscribed family Nymphaeaceae (including Cabombaceae) unplaced in any order. The APG III system did separate the Cabombaceae from the Nymphaeaceae and placed them in the order Nymphaeales together with the Hydatellaceae. The family Hydatellaceae was placed among the monocots in previous systems, but a 2007 study found that the family belongs to the Nymphaeales. [15] In the APG IV system, Hydatellaceae, Cabombaceae and Nymphaeaceae are the three families included in the Nymphaeales. [16]

Some earlier systems, such as Cronquist's system of 1981, often included the Ceratophyllaceae and Nelumbonaceae in the Nymphaeales. Although, the Takhtajan system of 1980 separated the Nelumbonales, the new order was retained alongside the Nymphaeales in the superorder Nymphaeanae.

The Cronquist system placed the Nymphaeales in subclass Magnoliidae, in class Magnoliopsida [=dicotyledons]. In addition, Cronquist included the Ceratophyllaceae and split the family Barclayaceae from the Nymphaeaceae. Under the APG II system, the family Cabombaceae was included within the Nymphaeaceae, but could optionally be recognized separately. As of APG III, the two families are recognized separately.

The Dahlgren system placed the Nymphaeales with the Piperales in superorder Nymphaeanae, within subclass Magnoliideae (dicotyledons). Thorne's 1992 system (and 2000 revision) placed the Nymphaeales as the sole order in the superorder Nymphaeanae within subclass Magnoliideae (=dicotyledons).

Comparison of the Nymphaeales across five systems
APG III system [1]
Nymphaeales
Takhtajan system [17]
Nymphaeales
Cronquist system [18]
Nymphaeales
Dahlgren system [19]
Nymphaeales
Thorne system (1992) [20] & (2000) [21]
Nymphaeales
Hydatellaceae among monocots, as Hydatellales
Cabombaceae Cabombaceae
Brasenia, Cabomba
Cabombaceae
Brasenia, Cabomba
Cabombaceae Cabombaceae
Brasenia, Cabomba
Nymphaeaceae Nymphaeaceae
subf. Barclayoideae, Euryaloideae, Nymphaeoideae
Barclayaceae
Barclaya
Nymphaeaceae Nymphaeaceae
Barclaya, Euryale, Nuphar, Nymphaea, Ondinea, Victoria
Nymphaeaceae
Euryale, Nuphar, Nymphaea, Ondinea, Victoria
sister to eudicot clade Ceratophyllaceae Ceratophyllaceae Ceratophyllaceae in Ranunculanae
in Protealesin Nelumbonales Nelumbonaceae in Magnolianae

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References

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Further reading