Less favourable signs are furnished by such plants as Arundo Donax (in Germany), Cicuta virosa and Typha latifolia, which are found in stagnant and torpid waters.
There is, however, justification for referring some specimens to Arundo, Phragmites, and to the Bambuseae.
The tendency of the dunes to drift off on the landward side is prevented by the planting of bent-grass (Arundo arenaria), whose long roots serve to bind the sand together.
The most common plant here is the stiff sand-reed (Arundo arenaria), called sand-oats in Drente and Overysel, where it is much used for making mats.
The Arundo Donax, the tallest of European grasses, is largely grown for vine-stakes.