The Families of the Monocotyledons: Structure, Evolution, and Taxonomy - R.M.T. Dahlgren, H.T. Clifford, P.F. Yeo - Google Books

https://books.google.de/books?id=3iGndTFY0skC&pg=PA164-167#v=onepage

Morphological concepts; Chemical characters; Evolutionary concepts, classification; Criteira for the monocotyledons; Origin of the monocotyledons; Fossils; Distribution of character conditions; Ancestral and derived character states in monocotyledons in…