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. 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, but a phylogenetic study of the genus _ Nymphaea _ implies that the number of species could be more than 90. 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.
* 1 Fossils * 2 Classification * 3 References * 4 Further reading * 5 External links
The fossil record consists especially of seeds, but also pollen, stems, leaves, and flowers. It extends back to the Cretaceous . The crown group of the Nymphaeales has been estimated to be about 112 million years old. Some have suggested that this age might be too old.
The aquatic plant fossil _ Archaefructus _ possibly belongs to this group.
The Nymphaeales currently include three families and about 70 to 90 species.
order NYMPHAEALES CABOMBACEAE
* _ Trithuria _ (12 species)
_ Amborella _
_ Ceratophyllum _
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. In the APG IV system , Hydatellaceae, Cabombaceae and Nymphaeaceae are the three families included in the Nymphaeales.
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 . 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).
* ^ _A_ _B_ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". _Botanical Journal of the Linnean Society _. 161 (2): 105–121. doi :10.1111/j.1095-8339.2009.00996.x .
* ^ Peter F. Stevens. 2001 onwards. Angiosperm Phylogeny Website At: Missouri Botanical Garden Website. (see _External links_ below). * ^ The Plant List (website). 2010. (See _External links_ below.) * ^ Borsch, Thomas; Löhne, Cornelia; Samba Mbaye, Mame; Wiersema, John H. (2011). "Towards a complete species tree of Nymphaea: shedding further light on subg. Brachyceras and its relationships to the Australian water-lilies". _Telopea _. 13 (1-2): 193–217. * ^ "Nymphaeales: Fossil Record". University of California Museum of Paleontology . * ^ Else Marie Friis, Kaj Raunsgaard Pedersen and Peter R. Crane (15 March 2001). " Fossil evidence of water lilies (Nymphaeales) in the Early Cretaceous". _Nature _. 410 (6826): 357–360. PMID 11268209 . doi :10.1038/35066557 . * ^ Magallón, Susana; Castillo, Amanda (2009). "Angiosperm diversification through time". _ American Journal of Botany _. 96 (1): 349–365. PMID 21628193 . doi :10.3732/ajb.0800060 . * ^ Bell, Charles D.; Soltis, Douglas E. ; Soltis, Pamela S. (2010). "The age and diversification of the angiosperms re-revisited". _American Journal of Botany_. 97 (8): 1296–1303. PMID 21616882 . doi :10.3732/ajb.0900346 . * ^ Soltis, D. E. ; Bell, CD; Kim, S; Soltis, PS (June 2008). "The Year in Evolutionary Biology 2008". _Annals of the New York Academy of Sciences _. 1133 (1): 3–25. PMID 18559813 . doi :10.1196/annals.1438.005 . * ^ Saarela, J. M.; et al. (2007). " Hydatellaceae identified as a new branch near