Richard Spellenberg
#10 in Flowers
- National Audubon Society Field Guide to North American Wildflowers: Western Region
- Trees of Eastern North America
- Trees of Western North America
- The Audubon Society Field Guide to North American Wildflowers Eastern Region Turtleback
- The Sunflower Family : A Guide to the Family Asteraceae of the Contiguous United States
- Mark Alan Weatherby
- Lilya Wagner
- Oliver Lutz Radtke
- Tyler Volk
- James Marshall Crotty
- Richard Walsh
- John P. Gilbert
- Paul S. Cohen
- Paddy Slade
- Thomas W. Africa
- John M. Carrera
- Greg Woolf
- Penne L. Restad
- John Rowlands
- Matthias Seidel
- Jerry G. Scott
- James P. Leary
- Joseph A. Amato
- Brent Landau
- Irenäus Eibl-Eibesfeldt