Children (16 direct children, 26 direct and indirect children):
Hydrophyllum capitatum
(tree size 3)
Ballhead waterleaf
Hydrophyllum tenuipes
Pacific waterleaf
Hydrophyllum occidentale
(tree size 2)
Western waterleaf
Hydrophyllum virginianum
(tree size 2)
Eastern waterleaf
Hydrophyllum brownei
Brown's waterleaf
Hydrophyllum macrophyllum
(tree size 1)
Largeleaf waterleaf
Hydrophyllum fendleri
(tree size 2)
Fendler's waterleaf
Hydrophyllum canadense
Bluntleaf waterleaf
Hydrophyllum appendiculatum
Great waterleaf
Hydrophyllum alpestre
Hydrophyllum thompsonii
Hydrophyllum albifrons
Hydrophyllum patens
Hydrophyllum trilobum
Hydrophyllum lineare
Hydrophyllum magellanicum