Whitelock, Loran M. "Variation in the Mexican Cycad Dioon Edule (Zamiaceae)."
Tropical house - Collections include Ananas comosus, Annona muricata, bromeliads, Caryota mitis, Cocos nucifera, Coffea arabica, cycads (including a Dioon spinulosum given by Smith College in the 1920s), Heliconia vellerigera, Kigelia pinnata, Musa, orchids, Oryza sativa, Piper nigrum, Rhizophora mangle, and Theobroma cacao.