He was returned to parliament in 1796 as MP for Elginshire, serving until 1807.
[1] As a botanist, Brodie specialised in cryptogamic flora, i.e. plants which reproduce by spores, such as algae, ferns and mosses.
He discovered a number of new species both around Edinburgh and on his own property at Brodie.
His collection is now held at the Royal Botanic Garden Edinburgh.
[2] He corresponded with other eminent botanists of his time, including Sir William Jackson Hooker and Sir James Edward Smith.