- Trithuria
Taxobox
name = "Trithuria"
regnum =Plant ae
divisio =Angiospermae
ordo =Nymphaeales
familia =Hydatellaceae
genus = "Trithuria"
subdivision_ranks = Species
subdivision = See text"Trithuria" is a
genus of of minute aquatic herbs in the familyHydatellaceae . Recently the genus "Hydatella" was subsumed within "Trithuria".These diminutive, moss-like, aquatic plants are the closest living relatives of water-lilies and their allies. They reside near the point at which water-lilies (order
Nymphaeales ) diverged from other flowering plants. Only a single angiosperm species,Amborella trichopoda , diverged from other flowering plants below this point. [Botany: New home for tiny aquatics, Else Marie Friis & Peter Crane, Nature 446, 269-270 (15 March 2007) ]Morphology places these plants near the base of the
angiosperm clade . This position is supported by ten unequivocal synapomorphies
* lack of a vascular cambium,
* lack of pericyclic sclerenchyma,
* anomocytic stomata,
* truncate anther connective,
* boat-shaped pollen,
* inner integument with two cell layers,
* palisade exotesta,
* seed operculum formed by cell enlargement in the inner integument,
* perisperm and
* hypogeal germination. [Hydatellaceae identified as a new branch near the base of the angiosperm phylogenetic tree. Jeffery M. Saarela1, et. al., Nature 446, 312-315 (15 March 2007)]References
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