A vigorous, creeping perennial with long stolons, rooting at nodes, with culms ascending to erect, branching, solid, slightly compressed.
Leaf-blade linear or lanceolate-acuminate, glabrous (smooth) to sparsely pubescent (hairy).
Inflorescence with two or occasionally three diverging racemes.
Rapidly invades wet habitats from sea level to 2,000 m. It forms a dense ground cover even on acidic, low-nutrient soils. Neal (1965) noted that “some native forests have become extinct due to this pest.”
Photo: Robert Whyte