Flora and Fauna
- 1843
- Attack on Giant Salvinia
- Illustrated article about USDA efforts to control its spread from Agricultural Research magazine.
- 1855
- The Azolla page
- Includes comparison of A. filiculoides Lam. (subgenus Azolla) and A. pinnata var. africana (subgenus Rhizosperma)
- 1857
- Botrychium lunaria: Moonwort
- A number of photographs of fertile spikes and fronds of this species, and its identifying features.
- 1858
- Order Charales
- Information on this order of green algae containing a single family, Characeae, and their phylogenetic relationships.