Ruppiaceae
Encyclopedia
Ruppia, also known as the ditch grasses, is the only genus in the family Ruppiaceae. Such a family has been recognized by relatively few taxonomists. The genus name was given in honour of Heinrich Bernhard Rupp, a German botanist (1688-1719).
The APG II system
, of 2003 (unchanged from the APG system
, of 1998), does recognize such a family and places it in the order Alismatales
, in the clade monocots.
According to the AP-Website the family is doubtfully distinct from the family Cymodoceaceae: the plants in the three families Cymodoceaceae, Posidoniaceae and Ruppiaceae form a monophyletic group.
The Cronquist system
, of 1981, placed the family in order Najadales
of subclass Alismatidae
in class Liliopsida
[=monocotyledons] in division Magnoliophyta [=angiosperms].
Species include:
The APG II system
APG II system
The APG II system of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group. It was a revision of the first APG system, published in 1998, and was superseded in 2009...
, of 2003 (unchanged from the APG system
APG system
The APG system of plant classification is the first, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in 1998 by the Angiosperm Phylogeny Group. It was superseded in 2003 by a revision, the APG II system, and then in 2009 by a further...
, of 1998), does recognize such a family and places it in the order Alismatales
Alismatales
Alismatales is an order of flowering plants including about 2500 species. Pleants assigned to this order are mostly tropical or aquatic.-Description:...
, in the clade monocots.
According to the AP-Website the family is doubtfully distinct from the family Cymodoceaceae: the plants in the three families Cymodoceaceae, Posidoniaceae and Ruppiaceae form a monophyletic group.
The Cronquist system
Cronquist system
The Cronquist system is a taxonomic classification system of flowering plants. It was developed by Arthur Cronquist in his texts An Integrated System of Classification of Flowering Plants and The Evolution and Classification of Flowering Plants .Cronquist's system places flowering plants into two...
, of 1981, placed the family in order Najadales
Najadales
Najadales is a botanical name of an order of flowering plants. A well-known system that used this name is the Cronquist system , that used this name for an order in subclass Alismatidae with this circumscription:* order Najadales...
of subclass Alismatidae
Alismatidae
Alismatidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used ; the only requirement being that it includes the family Alismataceae...
in class Liliopsida
Liliopsida
Liliopsida is a botanical name for the class containing the family Liliaceae . It is considered synonymous with the name monocotyledon. Publication of the name is credited to Scopoli : see author citation...
[=monocotyledons] in division Magnoliophyta [=angiosperms].
Species include:
- Ruppia cirrhosaRuppia cirrhosaRuppia cirrhosa is a species of aquatic plant known by the common name spiral ditchgrass. It is native to the Americas and Europe, where it grows in freshwater bodies, such as lakes. It is a thread-thin, grasslike perennial herb which grows from a rhizome anchored in the wet substrate. It produces...
- Ruppia maritimaRuppia maritimaRuppia maritima is a species of aquatic plant known by the common name wigeongrass. Despite its Latin name, it is not a marine plant; is perhaps best described as a salt-tolerant freshwater species.-Distribution:...
- Ruppia megacarpa