On lower, wetter cobble are small patches of water-willow. Island has battered trees and sycamore saplings. A few (~10) plants of Baptisia australis were found in similar habitat upstream.;Cobble and sand deposition on flat bedrock in upper channel of river, community is an herbaceous prairie dominated by warm season grasses and other shade intolerant graminoids and forbs. Tough sedges grow along the edge of the other vegetation. There is scoured-out vegetated bedrock along river and behind cobble-sand deposition. Shrubs are kept low by high energy floods.
Representativeness
Small patch of riverscour prairie at widest extent. Placed plot to exclude heavy shrub/sapling cover. Repeats on islands and along edges of river. There is about 1m of elevation variation within the plot.