Boloria improba Butler, 1877

Host plants:
The larvae especially feed on creeping willows like Salix herbacea and Salix reticulata, but also Polygonum viviparum.

Habitat:
Boloria improba inhabits mountain tundra with low-growing plants, in N-Europa mainly between 400 and 1000m. The larvak host plants are usually very abundant in the butterfly habitats.

Life cycle:
The larvae hibernate at least twice, the first time when still small, then in the penultimate instar. The butterflies occur quite late from late June to early August. Oviposition takes place on the ground near the host plant on this plant itself and moss, lichens, dead leaves. The female tends to oviposit as deep as possible. Boloria improba may be common at its often strictly confined sites (even in a obviously uniformous landscape).

Remarks:
Boloria improba occurs around the Arctic in N-Europe, N-Asia (NE-Russia) and N-America (Alaska, Rocky Mountains up to Colorado). In N-Europe only a few populations are known in N-Sweden (Abisko), N-Finland (Kilpisjärvi) and N-Norway.