New Zealand Map Series 260:
M35 855 465 (WGS84 -43.488537 172.696966)
Habitat:
Mostly clay overlaid with humus.
Notes:
Usually erect to ± 160 cm, spreads at frightening rate from a few plants in 1996 to thousands in 2004, along waterways or damp places inspite of hand weeding & poisoning. Usually upright 1.8 m drawn down by creeping bent.