A geographical atlas of world weeds.
The book consists of tables of 8000 weed species in alphabetical order of scientific name with authorities; a geographical code indicates the main countries or areas of distribution and a 5-point scale is used to indicate the relative importance of every species in each country or region. A local scientist assigned the degrees of importance. No maps, common names or references are given. The nomenclature has been updated and synonyms of scientific names are given. The introduction and geographical codes are given in the 10 major languages of the world to make it useable by a wide international readership. The book is designed to show how the same weed species may be common to a number of different regions of the world.<new para>ADDITIONAL ABSTRACT:<new para>About 8,000 species of plants that behave as weeds in agricultural situations are listed with respect to geographic range and importance in this atlas. All plant names are given in Latin, and the three most common synonyms for current scientific nomenclature are also listed. Geographic ranges are given as 2 or 3 letter abbreviations for 124 countries. Each country symbol is placed under a ranked system indicating whether the weed is a serious weed, a principal weed, a common weed, present (behaves as a weed, but importance unknown), or flora (present in country, but not confirmed as behaving as a weed).