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Plant Systematics: An Integrated Approach (4th ed.). CRC Press. ISBN 978-1-00-057677-1. Thorne, R.F. (1968). "Synopsis of a putative phylogenetic classification...

Plant Systematics: An Integrated Approach (4th ed.). CRC Press. ISBN 978-1-00-057677-1. Stevenson, D. W.; Davis, J. I.; Freudenstein, J. V.; Hardy, C. R...