India on March , with Calcutta as the headquarters of BSI. Jammu Tavi Botanical Garden has been named after Dr. E. K.
Janaki Ammal. Figure . : Dr. E.K.
Janaki Ammal expressing the relationship between the organisms. Taxonomists have assigned a method of classifying organisms which are called ranks. These taxonomical ranks are hierarchical. The scheme of classification has to be flexible, allowing newly discovered living organisms to be added where they fit best.
. Need for Classification • Understanding the classification of organisms can give an insight into other fields and has significant practical value. • Classification helps us to know about different taxa, their phylogenetic relationship and exact position. • It helps to train the students of plant sciences with regard to the diversity of organisms and their relationship with other biological branches.
, species. In this system the seeded plants were classified into major classes such as Dicotyledonae, Gymnospermae and Monocotyledonae. Class I Dicotyledonae: Plants contain two cotyledons in their seed, leaves with reticulate venation, tap root system and tetramerous or pentamerous flowers come under this class. It includes three sub- classes – Polypetalae, Gamopetalae and Monochlamydeae .
Sub-class . Polypetalae: Plants with free petals and dichlamydeous flowers come under polypetalae. It is further divided into three series – Thalamiflorae, Disciflorae and Calyciflorae . Series (i) Thalamiflorae: Plants having flowers with dome or conical shaped thalamus and superior ovary are included in this series.
It includes orders and families. Series (ii) Disciflorae: Flowers having prominent disc shaped thalamus with superior ovary come under this series. It includes orders and families. Series (iii) Calyciflorae: It includes plants having flowers with cup shaped thalamus and with inferior or sometimes with half inferior ovary.
Calyciflorae includes orders and families. Sub-class . Gamopetalae: Plants with united petals, which are either partially or completely fused to one another and dichlamydeous are placed under Gamopetalae. It is further divided into three series – Inferae, Heteromerae and Bicarpellatae.
Series (i) Inferae: The flowers are epigynous and with inferior ovary. Inferae includes