Raunkiaers System

Of the several systems that have been proposed for classifying terrestrial plant life-forms, the most widely used in the phytogeographical literature ofthe twentieth century is that of Christen C. Raunkiaer. In addition to the three philosophical dicta linking plant form to ecological conditions, Raunkiaer adopted three practical guidelines for his classification system: (1) the basis for classifying life-forms must be structural and biologically important to survival and growth, (2) the features used must be readily observed under field conditions such that plants can be easily classified, and (3) the features must establish a homogenous system ofclassification that enables a statistical comparison of different vegetational types based on the frequency of life-forms in each vegetation type.

Raunkiaer selected a single criterion for classifying plants, that is, the location of perennating buds (shoot apical meristems) with respect to ground level. The logic of this system rests on the supposition that the location of buds is indicative of the degree of protection they are afforded from inclement climatic conditions. Using this single criterion, five major life-forms are recognized (Figure 2).

Trash To Cash

Trash To Cash

This book will surely change your life due to the fact that after reading this book and following through with the steps that are laid out for you in a clear and concise form you will be earning as much as several thousand extra dollars a month,  as you can see by the cover of the book we will be discussing how you can make cash for what is considered trash by many people, these are items that have value to many people that can be sold and help people who need these items most.

Get My Free Ebook


Post a comment