CONTENTS. 



Preface ix 



Introduction x 



Key to the Orders xvi 



Subkingdom Pteridophyta 



Order i. Ophioglossales 



Family i. Ophioglossaceae 



Order 2. Filicales 



Family 2. Polypodiaceae 



Order 3. Salviniales 5 



Famijy 3. Marsileaceae 5 



Order 4. Equisetales 5 



Family 4. Equisetaceae 5 



Order 5. Isoetales 5 



Family 5. Isoetaceae 5 



Order 6. Lycopodiales 6 



Family 6. Lycopodiaceae 6 



7. Selaginellaceae 6 



Subkingdom Spermatophyta 7 



Class I. Gymnospermae 7 



Order 7. Pinales 7 



Family 8. Pinaceae 7 



9. Juniperaceae 9 



Order 8. Gnetales 10 



Family 10. Ephedraceae 10 



Class 2. Angiospermae 11 



Subclass I. Monocotyledones i r 



Order 9. Pandanales it 



Family 11. Typhaceae 11 



12. Sparganiaceae 11 



Order 10. Naiadales 12 



Family 13. Zanichelliaceae 12 



14. Naiadaceae 13 



Order 11. Alismales 13 



Family 15. Scheuchseriaceae 14 



16. Alismaceae 14 



Order 12. Hydrocharitales 15 



Family 17. Elodiaceae IS 



Order 13. Poales IS 



Family 18. Poaceae 15 



19. Cyperaceae 57 



Order 14. Arales 74 



Family 20. Araceae 74 



21. Lemnaceae 74 



Order 15. Xyridales 75 



Family 22. Commelinaceae 75 



23. Pontederiaceae 75 



Order 16. Liliales 7^ 



Family 24. Melanthaceae 7^ 



25. Juncaceae 77 



26. Alliaceae 81 



