Revision of Philodendron Subgenus Pteromischum (Araceae) for Pacific and Caribbean Tropical America
Comparative External Pollen Ultrastructure of the Araceae and Putatively Related Taxa
Palynology and Phylogeny of the 'Araceae'
Systematic Botany Monographs
Palynology and Phylogeny of the Araceae
Disengagement in Europe/Michael Howard
On the Fifth Night
A Preliminary Checklist to the Pteridophytes of Finca La Selva, Costa Rica
Mesoamerican Bactris (Palmae)
A New Genus and Species of Nephtheid Soft Coral (Octocorallia: Alcyonacea) from the Western Pacific Ocean, and a Discussion of Convergence with Several Deep-sea Benthic Organisms
Michael Howard's Algarve
Sir Michael Howard Interviewed by Brian Bond
Manual de plantas de Costa Rica /B.E. Hammel [and others] editores ; Silvia Troyo, ilustraciones