Waterope
Due it's tendency to grow all the way to the waterlevel even when it can root itself quite deep, it's named as the rope of the waters. It has slight iridescent hue in it. Unedible, but used in dyes.
Obtainable from gathering activity (crepuscular) and is used crafting Green Paint, Squeaky Clean Sponge and Timeshift Syrup. Can be sold in the shop for 100 Cr.