During his long career in the ICS, Drummond also gained an expert knowledge of the flora of the western Punjab, where he made significant collections of plant specimens. He also collected in the
Simla Hills, around
Dalhousie and the
Ganges. During his last few months in India, he was appointed curator of the herbarium at the
Calcutta Royal Botanic Gardens. On his return to England in 1905, he continued his botanical work at
Kew, determining his collections and preparing a flora of the Punjab. However, poor health compromised his efforts and he died having published only a few works, notably a detailed paper on the
Agave and
Furcraea of India co-written by
David Prain and published in the
Land Records and Agriculture, Bengal, 1905. ==References==