Distribution and biological peculiarities in Armenia: The species is widely distributed in the Palearctic. Armenia is inhabited by subspecies G. a. lugens (Caradja, 1893), which widely occurs in the country occupying wide variety of grasslands and even scarce woodlands at the elevation range from 400 to 2200 m a.s.l. The species uses wide variety of Legumes as the host plants, including Medicago, Astragalus, Onobrychis, Chamaecytisus, Genista, and others. During its development, the Green-underside Blue is connected with ants of genera Formica, Camponotus, Myrmica, Lasius, and Tapinoma. The species gives one generation per year having butterflies on wing from late April till late June, depending on elevation.
Population dynamics: The species is slightly uncommon within typical habitat and shows stable population trend in 2003-2013 (p>0.05). Most probably the species' ability to switch among host plants secures its survival under conditions of intensive grazing and mowing.
Conservation measures: The species is not included in the Global and National Red Lists., as well as in CITES and Bern Conventions, but is assessed for the European Red Book as a Least Concern. Apparently the Green-underside Blue deserves the same status for Armenia, especially taking into consideration that its distribution range is covered by number of protected areas, Emerald Sites and Prime Butterfly Areas. Therefore, there is no need for additional conservation measures, but the monitoring of the species as a grassland specialist remains important.