The Priority List of Genera - as of November 2001
The following list of genera is a work in progress and represents the latest recommendation from the USDA Herbaceous Ornamental Crop Germplasm Committee (HOCGC):

1. Aglaonema
2. Alstroemeria
3. Anthurium
4. Aquilegia
5. Aster
6. Baptisia
7. Begonia
8. Campanula
9. Chrysanthemum
10. Dianthus
11. Dieffenbachia
12. Euphorbia (Poinsettia)
13. Geranium
14. Hemerocallis
15. Impatiens
16. Iris
17. Lilium
18. Narcissus
19. Pelargonium
20. Petunia
21. Phalaenopsis
22. Philodendron
23. Phlox
24. Rudbeckia
25. Salvia
26. Spathiphyllum
27. Tagetes
28. Verbena
29. Veronica
30. Viola