Ha descritto numerose nuove famiglie botaniche tra cui: Alseuosmiaceae, Anarthriaceae, Hanguanaceae, Carlemanniaceae, Dioncophyllaceae, Ecdeiocoleaceae, Emblingiaceae, Oncothecaceae, Paracryphiaceae, Rapateaceae, Sladeniaceae e Tetramelaceae.
Opere Sphenocleaceae, Flora of Tropical East Africa, London, 1968, 3 p. The Euphorbiaceae of Borneo, Kew Bulletin. Additional Series vol. 4, London, 1975, 243 p. The Euphorbiaceae of New Guinea, Kew Bulletin. Additional Series vol. 18, London, 1980, 243 p. John Christopher Willis, A dictionary of the flowering plants and ferns, 8e édition revue par H.K.A. Shaw, Cambridge, 1985, xxii + 1245 + lxvi p.
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