Belongs within: Alismatales.
Contains: Potamogetonaceae.
The Potamogetonales are a group of aquatic flowering plants found in marine or fresh water. Members include the freshwater Aponogeton, found in the Old World tropics and subtropics, which bear long-petioled, submerged and/or floating leaves, and flowers in spikes (borne singly or in clusters of two to ten) with flowers sessile (Yadav & Gaikwad 2003). The Zosteraceae are marine perennials with flowers borne in an inflorescence enclosed, at least at first, in a spathe-like leaf-sheath (Moore & Edgar 1970).
Characters (Healy & Edgar 1980, as Potamogetonales + Apogetonales): Fresh-water or marine rhizomatous perennials. Leaves linear to orbicular or oblong, sheathing at base; sheath often ligule-like above. Flowers small, bisexual or unisexual, flowers in spikes or solitary, ebracteate. Perianth-segments 1–4 or 0. Stamens 1–6. Carpels 1–6.
<==Potamogetonales
|--Cymodoceaceae [Cymodoceales]HL09
| |--Amphibolus griffithiiK90
| |--Thalassodendron Hartog 1970HL09
| | `--T. ciliatum (Forsskål) Hartog 1970 [=Zostera ciliata Forsskål 1775]HL09
| |--HaloduleH93
| | |--H. pinifolia (Miki) den Hartog 1964HS14
| | |--H. uninervis (Forsskål) Ascherson 1882HS14
| | `--H. wrightiiH93
| |--SyringodiumK90
| | |--S. filiformeCH97
| | `--S. isoetifolium (Ascherson) Dandy 1939HS14
| `--CymodoceaDS04
| |--C. angustata Ostenfeld 1916HS14
| |--C. antarctica (see below for synonymy)B78
| |--C. ciliataB78
| |--C. isoetifoliaB78
| |--C. nodosaGFW98
| `--C. serrulata (Brown) Ascherson & Magnus 1870HS14 [=Caulinia serrulataB78]
`--+--+--PotamogetonaceaeDS04
| `--Ruppia Linnaeus 1753ME70 [RuppiaceaeHE80]
| |--R. cirrhosa [incl. R. spiralis]H93
| |--R. maritimaC06
| | |--R. m. var. maritimaC06
| | |--R. m. var. occidentalisV72
| | `--R. m. var. rostellataC06
| |--R. megacarpa Mason 1967ME70
| |--R. polycarpa Mason 1967ME70
| `--R. tuberosaKM08
`--AponogetonalesHE80
|--ZosteraceaeHE80
| |--PhyllospadixH93
| | |--P. iwatensisB79
| | |--P. scouleriH93
| | `--P. torreyiH93
| `--Zostera Linnaeus 1753ME70
| | i. s.: Z. hornemannianaPP64
| | Z. marina [incl. Z. marina var. latifolia]H93
| | Z. nanaC06
| | Z. noltiiBD95
| | Z. pacifica [incl. Z. asiatica]H93
| | Z. tasmanica Martens ex Aschers. 1867–1868C06
| `--Z. sect. ZosterellaME70
| |--Z. capricorni Aschers. 1876ME70
| `--Z. muelleri Irmisch ex Aschers. 1867 [incl. Z. novazelandica Setchell 1933]ME70
`--Aponogeton Linnaeus 1781 (see below for synonymy)YG03
|--*A. natans (Linnaeus) Engl. & Krause 1906 (see below for synonymy)YG03
|--A. abyssinicusYG03
|--A. appendiculatus Bruggen 1968YG03
|--A. azureusCV06
|--A. bruggenii Yadav & Govekar 1994YG03
|--A. crispus Thunberg 1781 [=A. crispum; incl. A. echinatus Roxburgh 1832, A. echinatum]YG03
|--A. decaryiYG03
|--A. distachyus Linnaeus 1781 [=A. distachyon]HE80
|--A. elongatusB78
|--A. euryspermusLK14
|--A. fenestralisM16
|--A. kimberleyensisLK14
|--A. lakhonensis Camus 1909 [incl. A. luteus, A. pygmaeus Krause 1910]YG03
|--‘*Uvirandra’ madagascariensis Mirbel 1802 [=Urirandra madagascariensis]YG03
|--A. satarensis Sundararagh., Kulkarni & Yadav 1982YG03
`--A. undulatus Roxburgh 1832 (see below for synonymy)YG03
Aponogeton Linnaeus 1781 [=Amogeton Necker 1790 (nom. inv.); incl. Uvirandra Mirbel 1802, Urirandra; Aponogetonaceae, Aponogetonineae]YG03
*Aponogeton natans (Linnaeus) Engl. & Krause 1906 [=*Amogeton natans; incl. Parua kelanga, A. monostachyon Linnaeus 1782, Spathium monostachyum Edgew. 1843]YG03
Aponogeton undulatus Roxburgh 1832 [=A. undulatum, Spathium undulatum (Roxburgh) Edgew. 1843, Ouvirandra undulata (Roxburgh) Edgew. 1844; incl. Aponogeton microphyllum Roxburgh 1832, Spathium microphyllum (Roxburgh) Voigt 1845, A. stachyosporus de Wit 1958]YG03
Cymodocea antarctica [=Amphibolis antarctica, Caulinia antarctica, Ruppia antarctica; incl. Amphibolis zosterifolia]B78
*Type species of generic name indicated
References
[BD95] Bakalem, A., & J.-C. Dauvin. 1995. Inventaire des crustacés amphipodes (Gammaridea, Caprellidea, Hyperiidea) des costes d’Algérie: essai de synthèse. Mésogée 54: 49–62.
[B78] Bentham, G. 1878. Flora Australiensis: A description of the plants of the Australian Territory vol. 7. Roxburghiaceae to Filices. L. Reeve & Co.: London.
[B79] Buss, L. W. 1979. Habitat selection, directional growth and spatial refuges: why colonial animals have more hiding places. In: Larwood, G., & B. R. Rosen (eds) Biology and Systematics of Colonial Organisms pp. 459–497. Academic Press: London.
[CH97] Castro, P., & M. E. Huber. 1997. Marine Biology 2nd ed. WCB McGraw-Hill: Boston.
[C06] Cheeseman, T. F. 1906. Manual of the New Zealand Flora. John Mackay, Government Printer: Wellington.
[CV06] Craven, P., & P. Vorster. 2006. Patterns of plant diversity and endemism in Namibia. Bothalia 36 (2): 175–189.
[DS04] Davis, J. I., D. W. Stevenson, G. Petersen, O. Seberg, L. M. Campbell, J. V. Freudenstein, D. H. Goldman, C. R. Hardy, F. A. Michelangeli, M. P. Simmons, C. D. Specht, F. Vergara-Silva & M. Gandolfo. 2004. A phylogeny of the monocots, as inferred from rbcL and atpA sequence variation, and a comparison of methods for calculating jackknife and bootstrap values. Systematic Botany 29 (3): 467–510.
[GFW98] Gattuso, J.-P., M. Frankignoulle & R. Wollast. 1998. Carbon and carbonate metabolism in coastal aquatic ecosystems. Annual Review of Ecology and Systematics 29: 405–434.
[HE80] Healy, A. J., & E. Edgar. 1980. Flora of New Zealand vol. 3. Adventive cyperaceous, petalous and spathaceous monocotyledons. P. D. Hasselberg, Government Printer: Wellington (New Zealand).
[H93] Hickman, J. C. (ed.) 1993. The Jepson Manual: Higher Plants of California. University of California Press: Berkeley (California).
[HL09] Huisman, J. M., F. Leliaert, H. Veerbruggen & R. A. Townsend. 2009. Marine benthic plants of Western Australia’s shelf-edge atolls. Records of the Western Australian Museum Supplement 77: 50–87.
[HS14] Huisman, J. M., & A. Sampey. 2014. Kimberley marine biota. Historical data: marine plants. Records of the Western Australian Museum Supplement 84: 45–67.
[K90] Keighery, G. J. 1990. Vegetation and flora of Shark Bay, Western Australia. In: Berry, P. F., S. D. Bradshaw & B. R. Wilson (eds) Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee pp. 61–87. Western Australian Museum.
[KM08] Keighery, G. J., & W. Muir. 2008. Vegetation and vascular flora of Faure Island, Shark Bay, Western Australia. Records of the Western Australian Museum Supplement 75: 11–19.
[LK14] Lyons, M. N., G. J. Keighery, L. A. Gibson & T. Handasyde. 2014. Flora and vegetation communities of selected islands off the Kimberley coast of Western Australia. Records of the Western Australian Museum Supplement 81: 205–244.
[M16] Maiden, J. H. 1916. Exhibit. Journal and Proceedings of the Royal Society of New South Wales 49 (4): xix–xx.
[ME70] Moore, L. B., & E. Edgar. 1970. Flora of New Zealand vol. 2. Indigenous Tracheophyta: Monocotyledones except Gramineae. A. R. Shearer, Government Printer: Wellington (New Zealand).
[PP64] Peres, J. M., & J. Picard. 1964. Nouveau manuel de bionomie benthique de la mer Mediterranee. Recueil des Travaux de la Station Marine d’Endoume, Bulletin 31 (27): 5–137.
[V72] Voss, E. G. 1972. Michigan Flora. Part I. Gymnosperms and Monocots. Cranbrook Institute of Science and University of Michigan Herbarium.
[YG03] Yadav, S. R., & S. P. Gaikwad. 2003. A revision of the Indian Aponogetonaceae. Bulletin of the Botanical Survey of India 45: 39–76.