An Illustrated Flora of the Northern United States, Canada and the British Possessions/Monocotyledones
| Sub-class 1. | Monocotylédones. |
Embryo of the seed with but a single cotyledon and the first leaves of the germinating plantlet alternate. Stem composed of a ground-mass of soft tissue (parenchyma) in which bundles of wood-cells are irregularly imbedded; no distinction into wood, pith and bark. Leaves usually parallel-veined, mostly alternate and entire, commonly sheathing the stem at the base and often with no distinction of blade and petiole. Flowers mostly 3-merous or 6-merous.
Monocotyledonous plants are first definitely known in Triassic time. They constitute between one-fourth and one-third of the living angiospermous flora.
| Monocotyledone Families |
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| Family | 1. | Typhaceae | Cat-Tail Family | |||||||||
| Family | 2. | Sparganiaceae | Bur-Reed Family | |||||||||
| Family | 3. | Zannichelliaceae | Pondweed Family | |||||||||
| Family | 4. | Naiadaceae | Naias Family | |||||||||
| Family | 5. | Zosteraceae | Eel-Grass Family | |||||||||
| Family | 6. | Scheuchzeriaceae | Arrow-Grass Family | |||||||||
| Family | 7. | Alismaceae | Water-Plantain Family | |||||||||
| Family | 8. | Vallisneriaceae | Tape-Grass Family | |||||||||
| Family | 9. | Hydrocharitaceae | Frog's-Bit Family | |||||||||
| Family | 10. | Gramineae | Grass Family | |||||||||
| Family | 11. | Cyperaceae | Sedge Family | |||||||||
| Family | 12. | Araceae | Arum Family | |||||||||
| Family | 13. | Lemnaceae | Duck-Weed Family | |||||||||
| Family | 14. | Mayacaceae | Mayaca Family | |||||||||
| Family | 15. | Xyridaceae | Yellow-Eyed Grass Family | |||||||||
| Family | 16. | Eriocaulaceae | Pipewort Family | |||||||||
| Family | 17. | Bromeliaceae | Pine-Apple Family | |||||||||
| Family | 18. | Commelinaceae | Spiderwort Family | |||||||||
| Family | 19. | Pontederiaceae | Pickerel-Weed Family | |||||||||
| Family | 20. | Juncaceae | Rush Family | |||||||||
| Family | 21. | Melanthaceae | Bunch-Flower Family | |||||||||
| Family | 22. | Liliaceae | Lily Family | |||||||||
| Family | 23. | Convallariaceae | Lily-of-the-Valley Family | |||||||||
| Family | 24. | Trilliaceae | Wake-Robin Family | |||||||||
| Family | 25. | Smilaceae | Smilax Family | |||||||||
| Family | 26. | Haemodoraceae | Bloodwort Family | |||||||||
| Family | 27. | Amaryllidaceae | Amaryllis Family | |||||||||
| Family | 28. | Dioscoreaceae | Yam Family | |||||||||
| Family | 29. | Iridaceae | Iris Family | |||||||||
| Family | 30. | Marantaceae | Arrow-Root Family | |||||||||
| Family | 31. | Burmanniaceae | Burmannia Family | |||||||||
| Family | 32. | Orchidaceae | Orchid Family | |||||||||
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