1. Population variability in the genusTrichocereus (Cactaceae) in central Chile

   • Philip W. Rundel

   OriginalPaper Pages: 1 - 9

2. Ophrys helenae (Orchidaceae), eine lange verkannte Sippe der Balkanhalbinsel

   • Othmar Danesch
   • Edeltraud Danesch

   OriginalPaper Pages: 11 - 22

3. Different patterns of callose wall formation during megasporogenesis in two species ofOenothera (Onagraceae)

   • Inés Noher de Halac
   • Cornelia Harte

   OriginalPaper Pages: 23 - 38

4. Zur Morphologie und Entwicklungsgeschichte vonEunotia-Arten (Bacillariophyceae)

   • Lothar Geitler

   OriginalPaper Pages: 39 - 43

5. Host plants of someRhinanthoideae (Scrophulariaceae) of eastern North America

   • Lytton J. Musselman
   • William F. Mann Jr.

   OriginalPaper Pages: 45 - 53