Duvall, Melvin R. ; Clegg, Michael T. ; Chase, Mark W. ; Clark, W. Dennis ; Kress, W. John ; Hills, Harold G. ; Eguiarte, Luis E. ; Smith, James F. ; Gaut, Brandon S. ; Zimmer, Elizabeth A. ; Learn, Gerald H. Publication: Annals of the Missouri Botanical Garden Pub Date: 1993 DOI: 10.2307/2399849 Bibcode: 1993AnMBG..80..607D