KANAWAO (BROUSSAISIA ARGUTA)

DISTINGUISHING CHARACTERISTICS

  • upright woody shrub, with tallest stems more than six feet
  • leaves opposite each other on the stem; often three leaves attached in a whorl at same point on the stem
  • veins on leaves deeply recessed on upper surface and projecting downward on lower surface
  • margin of leaves with forward pointing teeth
  • leaves look similar to its cousin, the ornamental hydrangea (flowers very different)
  • kanawao is a endemic native Hawaiian plant

TRADITIONAL HAWAIIAN USES

  • none described in the standard references

HAWAIIAN RAIN FOREST ECOLOGY

  • common, sometimes dense shrub in undisturbed rain forest and the most abundant native shrub in Niaulani Rain Forest
  • although the female plants produce fruits, kanawao mostly spreads by sprouts emerging from underground roots
  • kanawao is disturbed by feral pigs who uproot and damage the roots that produce new upright stems
  • fencing in the 20th century at Niaulani helped protect this species at Niaulani which is uncommon in surrounding areas
  • kanawao grows taller than kahili ginger and so survived four decades of ginger dominance in the understory
  • in Niaulani, without pigs or ginger, the 15 or so scattered, surviving kanawao colonies are now expanding by root sprouts, with noticeable numbers of young, short, upright stems
KANAWAO-BROUSSAISIA-ARGUTA-patch
A cluster of kanawao, a native Hawaiian rain forest shrub, inside of Niaulani

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