Jones, D. L.: Cycads of the World, Smithsonian Institution Press, Washington, D. C., 1993.

Kenrick, P. and P.R. Crane: "The Origin and Early Evolution of Plants on Land, Nature, September 4, 1997, vol. 389, pages 33–39. A review of the evolution of the early terrestrial plants based on new paleobotanical discoveries and advances in the systematics of plants.

Lellinger, D. B.: A Field Manua of the Ferns and Fern-Allies of the United States and Canada, Smithsonian Institution Press, Washington D. C., 1985. Useful account of the 406 kinds of spore-bearing vascular plants found in this area.

Niklas, K.J.: "Aerodynamics of Wind Pollination," Scientific American, July 1987, pages 90–95. The complex aerodynamics of pollen grains and the structures on which they land exert a high degree of influence on the apparently random process of pollen dispersal.

Norstog, K.: "Cycads and the Origin of Insect Pollination," American Scientist, 1987, vol. 75, pages 270–79. Studies of one of the most ancient lines of living seed plants suggest that insect pollination was established before the origin of the angiosperms.

Raven, P.H. R.F. Evert, and S.E. Eichhorn: Biology of Plants, 5th ed., Worth, New York, 1992. A widely-used comprehensive general botany text by one of this text’s authors.

Richardson, D.H.S.: The Biology of Mosses, John Wiley and Sons, Inc., New York, 1981. Excellent, concise account of the mosses.

Scagel, R.F. and others: Plants: An Evolutionary Survey, Wadsworth, Belmont, CA, 1984. Comprehensive account of all groups of plants; highly recommended.

Stewart, W.N. and G.W. Rothwell: Paleobotany and the Evolution of Plants, 2d. ed., Cambridge University Press, New York, 1993. A survey of fossil plants.

Vidakovic, M., transl. by M. Soljan: Conifers, Graficki Zavod Hrvatske, 1991. A comprehensive, well-illustrated worldwide treatment of the conifers. (U.S. distributor of the English translation: University of Arizona Press).