Map is from The Atlas of Living Australia web site, licensed under Creative Commons Attribution 3.0 Australia License
Swamp Couch, Common Couch
Greencouch is a perennial grass that grows approximately 15 cm tall. It has the growth habit of running rhizomes that root at the nodes.
The leaf blades are flat, with the leaf sheath half as long as the internodes. Growing upright in line with the stem, the leaf blades reach a length of around 7 cm.
The plant's flowers have 2-7 spikes, each between 2 cm and 6 cm long and linear. They are green to purple and mostly flower between May and October.
The fruit is approximately 2.5 mm long.
Greencouch is often confused with saltcouch. Greencouch is generally a lower growing grass than saltcouch and less salt tolerant. Greencouch is a softer grass to touch and has more hairs along the stem than saltcouch.
Prefers moist sites such as stream sides, roadside drains and plains which are occasionally flooded. It is also able to tolerate dry sites and forms dense mats in favourable conditions. It is tolerant of slightly to moderately saline soils but more common in slightly saline soils.
Green couch is found throughout large parts of Australia in all states and territories, and is most common in coastal and sub-coastal regions.