| Cultivar | Plant Size | Leaf Color | Variegation | Var Color | Origin | Flower Color | Season | Source | Registered |
| H. montana | Large | Med-Green | - | - | Unknown | Pale-Lavender | June into July | Species from Japan | --NR-- |
| 'Umi Oba' | Large | Med-Green | Marginal | Yellow | Hybrid | Pale-Lavender | July | Unknown | --NR-- |
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