Merits of Bentham and Hooker classification :
(a) It is very convenient to the taxonomists, because it has quite accurate descriptions based on the live specimens or preserved herbarium sheets.
(b) The description of plant species are easy to follow and of practical utility for identification of species.
© It has also taken case to provide information related to geographical distribution of various genera and species.
(d) The placement of monocots after the dicots, also appears to be in accordance with the evolutionary trees.
Demerits of Bentham and Hooker classification:
(a) The position of Gymnospermae between dicots and monocots has not been acceptable and satisfactory.
(b) The system also does not take into account several important floral characters and neglects evolutionary consideration of genus, family and orders.
© Some closely related families are placed apart.
(d) Monochlamydae as a sub-class has been found to be an artificial group, and it becomes difficult to place closely related families like Chenopodiaceae and Caryophyllaceae close to each other.