September 2004. A weed of north Malaita, Solomon Islands, said to be newly arived (at Takwa mission).

It was identified as Knob weed (Hyptis capitata). It should have a square stem and a minty smell. It is spread by water, animals, humans, vehicles (slashers too). A good field reference is Smith NM (2002) Weeds of the wet/dry tropics of Australia. A field guide. It is relatively easy to manage in the Northern Territory, where hand pulling and glyphosate were effective control methods. It is reported to be “bad” weed in Samoa.