Genres
- Callitriche
- Euphorbiaceae
- Lemna
- Scientific expeditions
- Cruciferae
- Echinocactus
- Political and social views
- Boundaries
- Melocactus
- Cereus
- Nymphaea
- Yucca
- Nymphaeaceae
- United States Naval Expedition to Japan (1852-1854)
- United States. Commission on Boundary between the Indian Territory and Texas
- Correspondence
- Opuntia
- Botanical specimens
- Description and travel
- Wolffia
- Mammillaria (Cactus)
- Onagraceae
- Liliaceae
- Pereskia
- Callitrichaceae
- United States
- University of Cambridge
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