The following points highlight the fifteen important Thorne’s principles (1958) of plant classification. Thorne’s Principle # 1. Existing species have descended with change from pre-existing species and are therefore, the products of evolutionary forces. Thorne’s Principle # 2. Ancestral conditions and trends of specialisation are often recognisable in the organs, tissues and cells of living and fossil angiosperms. Thorne’s Principle [...]
The following points highlight the five periods in the history of plant classification in India. The periods are: 1. Rig Veda Period 2. The Greek Period 3. The Roman Period 4. The Dark Age, Herbals and the Transition Period 5. Modern Period. Period # 1. Rig Veda Period: According to Majumdar history of botany and plant taxonomy in India can [...]
In this article we will discuss about:- 1. Meaning of Herbarium 2. Functions of Herbarium 3. Kinds 4. Important Herbarium of The World 5. Significance. Meaning of Herbarium: A herbarium is a store house of plant specimens. In it dried, pressed, preserved and mounted plant specimens are arranged in a sequence of an accepted system of classification for future reference [...]