| Family | Lycaenidae |
|---|---|
| Subfamily | Polyommatinae |
| Genus | Glaucopsyche |
| Species | alexis |
| Authority | (Poda, 1761) |
| English Name | Green-underside Blue |
| European Red List 2010 | Least Concern (LC) |
|---|---|
| EU 27 Red List 2010 | Least Concern (LC) |
| European Red List 2025 | Least Concern (LC) |
| EU 27 Red List 2025 | Least Concern (LC) |
| Habitats Directive | |
| Bern Convention | |
| CITES |
The Green-underside Blue is a pretty sight on both dry and damp flower-rich grassy vegetation, such as meadows and woodland clearings. The females lay their eggs between the flowers of different leguminous plants, including Sainfoin (Onobrychis viciifolia), brooms (Cytisus spp.), vetches (Vicia spp.), Crown Vetch (Coronilla varia), Genista spp., and melilots (Melilotus spp.). The caterpillars feed on the leaves and are frequently attended by the workers of various ants. Hibernation takes place as a pupa. The Green-underside Blue is single-brooded.
Albania / Andorra (Possibly Present) / Austria / Belarus / Belgium / Belgium: Wallonia / Bosnia and Herzegovina / Bulgaria / Croatia / Czechia / Denmark (Irregular Vagrant) / Estonia (Regionally Extinct) / Finland / France / France: Mainland / France: Corsica / Germany / Greece / Greece: Mainland / Greece: East Aegean Islands / Hungary / Italy / Italy: Mainland / Italy: Sicily / Latvia / Liechtenstein / Lithuania / Luxembourg / North Macedonia / Moldova / Montenegro / Norway / Poland / Portugal / Portugal: Mainland / Romania / European Russia / San Marino / Serbia / Serbia: Serbia / Serbia: Kosovo / Slovakia / Slovenia / Spain / Spain: Mainland / Sweden / Switzerland / European Türkiye / Ukraine /