Botany

Botany was a scientific subject which dealt with plants. It was studied by Peri Brown before leaving with the Sixth Doctor (TV: Timelash, The Mysterious Planet et. al.); the Doctor defined her "a bit of botanist". (TV: Timelash)

George Cranleigh was a notorius botanist. Amy Johnson wrote A Textbook of Botany for Students, a book the Fifth Doctor came across while exploring Cranleigh Hall. (TV: Black Orchid)

Lord Ravensworth described himself as an "amateur botanist" and owned a book of botany. (TV: The Mark of the Rani)