P. ChampionAlligator weed shoot and flower.
Coffey and Clayton 1989Alligator weed in a drainage ditch.
Coffey and Clayton 1989Emergent shoot of parrot's feather showing minute flowers in the axils.
R.D.S. WellsParrot's feather in a drainage ditch in the Waikato.
A. TaumoepeauDrainage channel choked with hornwort - Click to enlarge
NIWAHydrilla
