| No. | Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
|
1
| 'Barbara May' | Medium | Blue/Green | | | Hybrid | Pale-Lavender | July to August | Solberg, Robert | .2004 |
|
2
| 'Gold in May' | Large | Yellow | | | Unknown | Unknown | Unknown | Wade, Van | --NR-- |
|
3
| 'Maggie May' | Large | Blue/Green | | | Hybrid | Pale-Lavender | July | Wasitis, Chick | .2001 |
|
4
| 'May' | Small | Blue/Green | | | TC Sport | Pale-Lavender | July | Hansen, Hans | .1999 |
|
5
| 'May Moon' | Medium | Med-Green | | | Hybrid | Light-Purple | August | Ward, Dr Dick & Ward, Jane | .1999 |
|
6
| 'May T. Watts' | Large | Yellow | | | TC Sport | Near-White | June to July | Zilis, Mark | .1985 |
|
7
| 'Mayday' | Small | Light-Green | Medial | White | Unknown | Unknown | Unknown | Unknown | --NR-- |
|
8
| 'Mayflower Moon' | Large | Yellow-Gold | | | Unknown | Pale-Lavender | July | Meyer, Bill & Brashear, Carol | --NR-- |
|
9
| 'Maytime' | Small | Yellow | | | Hybrid | Light-Purple | Unknown | Simpers, Lucille | --NR-- |
|
10
| 'Misty May' | Medium | Med-Green | Streaked | Speckles | Hybrid | Med-Lavender | July to August | Kuenster, Rod | .2008 |
|