Ranunculus
Regnellidium
Reussia
Rhaphidophora
beccarii
Rhodobryum
gigantea
Rhynchospora
albescens
colorata
Riccardia
chamedryfolia
multifida
Riccia
fluitans
Ricciocarpus
natans
Riella
Rondonanthus
Rorippa
aquatica
dubia
Rotala
anamika
bailyana
fimbriata
indica
kaserkodensis
khaleeliana
magenta
malabarica
malampuzhensis
meenkulamensis
mexicana
occultiflora
ramosior
ritchiei
rosae
rotundifolia
sahyadrica
serpyllifolia
species
tulunadensis
wallachi
Ruppia