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by Keller, Gary D.
by Adger; Carolyn Temple
by Bess, James L.; Dee, Jay R.; Johnstone, D. Bruce
by Deborah Hughes-Hallett (University of Arizona ); Patti Frazer Lock (St. Lawrence Univ.); Andrew M. Gleason (Harvard Univ.); et al.
by David Halliday (University of Pittsburgh)
by Peter H. Raven (Missouri Botanical Garden); Linda R. Berg (St. Petersburg Junior College); David M. Hassenzahl (Chatham University)
by John R. Schermerhorn (Ohio University)
by Killy, Elizabeth (Miami University)
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