In lieu of an abstract, here is a brief excerpt of the content:

SUMMARY OF THE TAXA TREATED IN THIS VOLUME Orders and Families Order 1. Alismales Family I. Butomaceae Family 2. Alismaceae Family 3. Hydrocharitaceae Order 2. Zosterales Family 4. Juncaginaceae Family 5. Scheuchzeriaceae Family 6. Potamogetonaceae Family 7. Ruppiaceae Family 8. Zannichelliaceae Order 3. Najadales Family 9. Najadaeeae Order 4. Arales Family rD. Acoraceae Family r I. Araceae Family 12. Lemnaceae Order 5. Typhales Family 13. Sparganiaceae Family 14. Typhaceae Order 6. Commelinales Family 15. Xyridaceae Family 16. Commelinaceae Family 17. Pontederiaeeae Family 18. JUl1caceae Totals Genera 3 3 2 I 1 5 4 I 2 4 2 35 Species 1 15 5 2 I 24 1 I 5 2 6 17 5 3 2 8 7 Varieties or Subspecies I .1 6 315 ...

Share