Molecular data suggest four clades are within the Cornales : " Grubbia-Curtisia ", with the Hydrostachyaceae in an uncertain position, possibly basal.
2.
The order is not recognized by the Angiosperm Phylogeny Group; the family Hydrostachyaceae is placed in the order Cornales and the plants making up the other two families are included in the family Plantaginaceae.
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