Ruppiaceae
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| Image:Ruppia rostellata-brachypus-spiralis nf.jpg from Lindman
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Ruppiaceae is the botanical name of a family of flowering plants. Such a family has been recognized by relatively few taxonomists.
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. The family consists of a single genus Ruppia, also known as the "ditch grasses".
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].
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