Everything about Alismatales totally explained
Alismatales is an order of
flowering plants. The order will of necessity contain the family
Alismataceae.
Taxonomy
The
APG II system, of 2003 (unchanged from the
APG system, of 1998) assigns the order to the clade
monocots and uses this circumscription:
Thus circumscribed, the order contains about 165 genera in 14 families, with a
cosmopolitan distribution. Most of the families are composed of
herbaceous plants, commonly found in aquatic environments. The
flowers are usually arranged in
inflorescences, and the mature seeds lack
endosperm.
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, totalling over two thousand species. The rest of families together contain just about five hundred species.
The
Cronquist system of 1981 placed the order in subclass
Alismatidae of class
Liliopsida [=monocotyledons] and used this circumscription:
order Alismatales
: family Alismataceae
: family Butomaceae
: family Limnocharitaceae
The Cronquist subclass Alismatidae conformed fairly closely to the order Alismatales as circumscribed by APG, minus the family Araceae.
The Dahlgren system placed the order in the superorder Alismatanae in the subclass Liliidae [=monocotyledons] in the class Magnoliopsida [=angiosperms]; it used this circumscription:
order Alismatales
: family Alismataceae
: family Aponogetonaceae
: family Butomaceae
: family Hydrocharitaceae
: family Limnocharitaceae
The Dahlgren superorder Alismatanae conformed fairly closely to the order Alismatales as circumscribed by APG, minus the family Araceae.
The Wettstein system, last version in 1935, and the Engler system, update in 1964, used the name Helobiae for the order.
Further Information
Get more info on 'Alismatales'.
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