Crow, G.E., and C.B. Hellquist. 2000a. Aquatic and wetland plants of northeastern North America: a revised and enlarged edition of Norman C. Fassett's A Manual of Aquatic Plants. Vol. 1. Pteridophytes, gymnosperms, and angiosperms: dicotyledons. Univ. of Wisconsin Press, Madison, WI, USA. Google Scholar