| 1 | Flowers pink, sometimes white |
| 1' | Flowers yellow, rarely purplish towards base |
| 2 | Flowers small, petals 5-6 mm long; plant with spreading or creeping stems, without bulbils |
| 2' | Flowers large, petals 18-25 mm long; plant without aerial stem, bulbils present at the base of leaves and along underground stem |
