References

For Pilularia

Dennis, W.M., and D.H. Webb. 1981. The distribution of Pilularia americana A. Br. (Marsileaceae) in North America, north of Mexico. Sida 9: 19-24. Google Scholar

Johnson, D.M. 1993c. Marsileaceae. In Flora of North America Editorial Committee. 1993b. Flora of North America north of Mexico. Volume 2, pteridophytes and gymnosperms. Oxford Univ. Press, New York, NY. 475 pp. Google Scholar

Kramer, K.U., and P.S. Green. 1990. Pteridophytes and Gymnosperms. In K. Kubitzki, ed., The families and genera of vascular plants. Springer-Verlag, Berlin. Google Scholar

Nagalingum, N.S., M.D. Nowak, and K.M. Pryer. 2008. Assessing phylogenetic relationships in extant heterosporous ferns (Salviniales), with a focus on Pilularia and Salvinia Bot. J. Linn. Soc. 157: 673-685. Google Scholar