- Pan-Pacific entomologist
- Pleurothallis subgenus Acianthera and three allied subgenera ; A second century of new species of Stelis of Ecuador ; Epibator, Ophidion, Zootrophion ; Addenda to Brachionidium, Dracula, Lepanthes, Platystele, Pleurothallis, Porroglossum, and Masdevallia ; New genera and combinations
- Preliminary notes on the Scrophulariaceae of Peru
- Preliminary studies in the palm genus Syagrus Mart. and its allies
- Preliminary taxonomic studies in the palm genus Attalea H.B.K
- Proceedings of the San Diego Society of Natural History
- Proceedings of the Zoological Society of London
- Pteridophyta of Peru. Part I. [Family] 1. Ophioglossaceae - 12. Cyatheaceae
- Pteridophyta of Peru. Part II. [Family] 13. Pteridaceae - 15. Dennstaedtiaceae
- Pteridophyta of Peru. Part III, [Family] 16. Thelypteridaceae
- Pteridophyta of Peru. Part IV, [Family] 17. Dryopteridaceae
- Pteridophyta of Peru. Part V, 18. Aspleniaceae-21. Polypodiaceae
- Pteridophyta of Peru. Part VI, 22. Marsileaceae-28. Isoetaceae
- Publication. Field Museum of Natural History. Botanical series
- Publications in biological oceanography