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  1. North American cottonwoods (Populus, Salicaceae) of sections Abaso and Aigeros
    By: Eckenwalder, James
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 58
    Date: 1977
    Page Range: 193--208
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  2. Taxonomy of the West Indian cycads
    By: Eckenwalder, James
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 61
    Date: 1980
    Page Range: 701--722
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