Medicinal plants
Quisumbing was author of taxonomic and morphological papers, many of which deal with orchids, including ‘Medicinal plants in the Philippines’ (Manila 1951). "Saccolabium quisumbingii" has been named in his honour. He was recipient of the Distinguished Service Star (1954) for outstanding contribution to the field of systematic botany; Diploma of Merit on Orchidology and Fellow Gold Medal, Malaysian Orchid Society (1966); Gold Medal, American Orchid Society (1969), and 1975 PhilAAS Most Outstanding Award.