Prostrate creeping herb that can occasionally be aquatic. Small broad oval leaves in pairs. Two-lipped blue, purple or pink flower with an upright yellow or white tube (sometimes with red spots), with a prominent yellow raised tongue at the base.
Roots at nodes forming mats of small paired fleshy stalkless leaves. Mauve flower resembling a monkey face is very distinctive.
Annual or perennial. Margins of lakes, swamps rivers, grassy wetlands, and temporarily damp places. Can tolerate salty soils, often in saltmarsh.
Tracheophyta (Vascular Plants)
Magnoliopsida (Flowering Plants)
Source: Atlas of Living Australia