Alismatales

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Alismatales
Alisma plantago-aquatica
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Alismatales
R.Br. ex Bercht. & J.Presl[1]
Families

See Taxonomy

Snake lily (Dracunculus vulgaris) of family Araceae in Crete, Greece.
Ottelia alismoides from family Hydrocharitaceae in Hyderabad, India.

The Alismatales (alismatids) are an order of

marine habitats. Perhaps the most important food crop in the order is the corm of the taro
plant, Colocasia esculenta.

Description

The Alismatales comprise

herbaceous flowering plants of often aquatic and marshy habitats, and the only monocots known to have green embryos other than the Amaryllidaceae. They also include the only marine angiosperms growing completely submerged, the seagrasses.[2] The flowers are usually arranged in inflorescences, and the mature seeds lack endosperm
.

Both marine and freshwater forms include those with staminate flowers that detach from the parent plant and float to the surface. There they can pollinate carpellate flowers floating on the surface via long pedicels.[3] In others, pollination occurs underwater, where pollen may form elongated strands, increasing chance of success. Most aquatic species have a totally submerged juvenile phase, and flowers are either floating or emerge above the water's surface. Vegetation may be totally submersed, have floating leaves, or protrude from the water. Collectively, they are commonly known as "water plantain".[4]

Taxonomy

The Alismatales contain about 165 genera in 13 families, with a

Acorales, the Alismatales are referred to informally as the alismatid monocots.[6]

Early systems

The Cronquist system (1981) places the Alismatales in subclass Alismatidae, class Liliopsida [= monocotyledons] and includes only three families as shown:

Cronquist's subclass Alismatidae conformed fairly closely to the order Alismatales as defined by APG, minus the Araceae.

The

Alismatanae in the subclass Liliidae [= monocotyledons] in the class Magnoliopsida
[= angiosperms] with the following families included:

In Tahktajan's classification (1997), the order Alismatales contains only the Alismataceae and Limnocharitaceae, making it equivalent to the Alismataceae as revised in APG-III. Other families included in the Alismatates as currently defined are here distributed among 10 additional orders, all of which are assigned, with the following exception, to the Subclass Alismatidae. Araceae in Tahktajan 1997 is assigned to the Arales and placed in the Subclass Aridae; Tofieldiaceae to the Melanthiales and placed in the Liliidae.[7]

Angiosperm Phylogeny Group

The Angiosperm Phylogeny Group system (APG) of 1998 and APG II (2003) assigned the Alismatales to the monocots, which may be thought of as an unranked clade containing the families listed below. The biggest departure from earlier systems (see below) is the inclusion of family Araceae. By its inclusion, the order has grown enormously in number of species. The family Araceae alone accounts for about a hundred genera, totaling over two thousand species. The rest of the families together contain only about five hundred species, many of which are in very small families.[8]

The

Maundiaceae, but the authors noted that more study was necessary before the Maundiaceae could be recognized.[1]

In

lumping" approach.[9]
Consequently, the family structure for APG IV is:

Cladogram of Alismatales[2]
Alismatales

Araceae

Tofieldiaceae

Aponogetonaceae

Scheuchzeriaceae

Juncaginaceae

Maundiaceae

Posidoniaceae

Cymodoceaceae

Ruppiaceae

Phylogeny

Cladogram showing the orders of monocots (Lilianae sensu Chase & Reveal)[10] based on molecular phylogenetic evidence:

Lilianae sensu Chase & Reveal[10]
Alismatid monocots

References

  1. ^
    hdl:10654/18083
  2. ^ a b Stevens, P.F. (2022). "Alismatales". Angiosperm Phylogeny Website. 14. Missouri Botanical Garden. Retrieved 28 October 2022.
  3. S2CID 13369438
    .
  4. ^ "-Alismatales (Water Plantains)" (PDF). Archived from the original (PDF) on 12 June 2010. Retrieved 27 May 2010.
  5. ^ Wilkin & Mayo 2013.
  6. ^ RBG 2010.
  7. ^ "-Flowering Plant Gateway". Archived from the original on 6 October 2011. Retrieved 27 May 2010.
  8. ^ a b APG IV 2016.
  9. ^ Christenhusz et al. (2015)
  10. ^ a b Chase & Reveal 2009.

Further reading

External links
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