CONTENTS. 



Preface ix 



Introduction xi 



Key to the Orders xvii 



Subkingdom Pteridophyta I 



Order i. Ophioglossales I 



Family i. Ophioglossaceae I 



Order 2. Filicales I 



Family 2. Polypodiaceae i 



Order 3. Salviniales 5 



Family 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. Finales 7 



Family 8. Pinaceae 7 



9. Juniperaceae 9 



Order 8. Gnetales 10 



Family 10. Ephedraceae 10 



Class 2. Angiospermae 1 1 



Subclass i. Monocotyledones 1 1 



Order 9. Pandanales 1 1 



Family 1 1. Typhaceae 1 1 



12. Sparganiaceae 1 1 



Order 10. Naiadales 12 



Family 13. Zanichelliaceae 12 



14. Naiadaceae 13 



Order n. Alismales 13 



Family 15. Scheuchseriaceae 14 



16. Alismaceae 14 



Order 12. Hydrocharitales 15 



Family 17. Elodiaceae 15 



Order 13. Poales 15 



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 76 



Family 24. Melanthaceae 76 



25. Juncaceae 77 



26. Alliaceae 81 



v 



