1. Introduction

   • Friedrich Ehrendorfer

   EditorialNotes Pages: 125 - 128

2. Comparative physiology, biochemistry, and the taxonomy ofChlorella (Chlorophyceae)

   • Erich Kessler

   OriginalPaper Pages: 129 - 138

3. Species diversity, ecology and evolution in a primitive Angiosperm genus:Hibbertia (Dilleniaceae)

   • G. Ledyard Stebbins
   • R. D. Hoogland

   OriginalPaper Pages: 139 - 154

4. Problems of species and genera inEucalyptus (Myrtaceae)

   • L. A. S. Johnson

   OriginalPaper Pages: 155 - 167

5. Biochemistry and species problems inAmbrosia (Asteraceae-Ambrosieae)

   • Willard W. Payne

   OriginalPaper Pages: 169 - 178

6. Numerical approaches to the species problem

   • Theodore J. Crovello

   OriginalPaper Pages: 179 - 187

7. Concluding remarks

   • Friedrich Ehrendorfer

   OriginalPaper Pages: 189 - 194