@article {573, title = {Leaves of the Helobiae}, journal = {Botanical Gazette}, volume = {72}, year = {1921}, pages = {31-38}, keywords = {Alismataceae, Aponogetonaceae, Butomaceae, Hydrocharitaceae, Juncaginaceae, Naiadaceae, Potamogetonaceae}, url = {http://www.jstor.org/stable/2470114}, author = {Arber, Agnes} }