New Zealand Map Series 260:
R13 89- 13- (WGS84 -37.462931 175.026186)
Altitudes:
from 10m
Habitat:
margins of lake in wetland and swampy ground.
Notes:
Forming very dense stands of almost pure O. regalis in places. Young plants very common and these are establishing outside of the very dense areas. This species is going to be very, very dominant unless action is taken to remove plants or control its spread.