Myriophyllum robustum and Gratiola concinna
Myriophyllum robustum is a creeping herb categorised as ‘at risk – declining’ and Gratiola is ‘threatened – nationally vulnerable’. Both have been recorded at Cold Creek on the southwestern side of Egmont National Park.
Observations suggest both species have declined in abundance in recent years, Myriophyllum in particular. This herb grows in shallow lakes, slow flowing streams, dune ponds, and in muddy or seasonally flooded ground while Gratiola is found in poorly drained turf of streamsides.