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 below mentioned article provides an overview on Families of Angiosperms. Angiosperms = Ovules or seeds enclosed in the ovary. I. Dicotyledons. II. Monocotyledons I. Dicotyledons: Flowers mostly tetra or pentamerous; leaves net veined; cotyledons usually two; stem commonly with vascular bundles arranged in a ring and open. This class is divided into polypetalae, gamopetalae and monochlamydeae. A. Polypetalae: Flowers [...]
In this article we will discuss about the contribution of various botanists towards plant classification. 1. Sexual (or Artificial) System of Linnaeus: Carolus Linnaeus (1707-1778), a Swedish naturalist published a sexual system of classification in Hortus Uplandicus (1730) and elaborated it in his Genera Plantarum (1737). The latter work is of importance in modern taxonomy as a source of description [...]