BOTANY Higher Secondary Second Year - Textbooks Online

Demerits of Bentham and Hooker’s classification of plants
1. The placement of Gymnospermae in between dicotyledonae and
monocotyledonae is an error.
2. Several important floral characters have been neglected in this
system.
3. Advanced family Orchidaceae has been considered as primitive
among monocotyledons and it is placed in the beginning of the system.
4. In this system, some closely related families have been separated
and placed under different groups. For example, all the families of series
Curvembryeae of Monochlamydeae are related to Caryophyllaceae of series
Thalamiflorae of Polypetalae, but they are separated.
5. Unrelated families have been grouped nearer. For example,
Podostemaceae of series Multiovulatae aquaticae of Monochlamydeae
deserves a place in Rosales of the series Calyciflorae of Polypetalae.
Similarly Laurineae of series Daphnales of Monochlamydeae deserves a
place in Ranales of the series Thalamiflorae of polypetalae. Thus, two
unrelated families Podostemaceae and Laurineae are grouped nearer.
Self Evaluation
I . Choose and write the correct options.
1. Genera plantarum of Bentham and Hooker was published in
a. a single volume b. two volumes
c. three volumes d. four volumes
2. In Bentham and Hooker classification of plants, the present day
‘orders’ were referred to by them as
a. series b. cohorts
c. orders d. families
3. Plants having flowers with free petals are placed under
a. Monochlamydeae b. Monocotyledons
c. Gamopetalae d. Polypetalae
4. Inferae includes
a. 6 orders and 34 families b. 4 orders and 23 families
c. 3 orders and 9 families d. 5 orders and 27 families
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