Robinson B. L., Flora of the Galapagos Islands, Proceedings of the American Academy of Arts and Sciences, 1902, 38(4):77-269
A floristic treatment of the archipelago based on collections and collaboration with specialists. The Cactaceae section contains descriptions by Karl Schumann, including the original diagnosis of Cereus nesioticus, now Brachycereus nesioticus. It presents stem, flower, fruit and seed structure, and specimen localities. The protologue on page 179 and information on authorship of specialist sections in the introduction were read directly.