McLean, R. C. (Robert Colquhoun), 1890- McLean, R. C. (Robert Colquhoun), 1890- Textbook of theoretical botany / by R.C. McLean and W.R. Ivimey-Cook ; [illus.] by K. Benson-Evans. - [London] : Longmans [Green], 1964- First published in 1951- Subjects--Topical Terms: Botany.