Glaucopsyche lygdamus, the Silvery Blue, can be found in numerous states in the West, South, Midwest, and Northeast.
Favorite nectar plants include: Taraxacum officinale and Erigeron
USDA Growing Zones for these plants include: 2,3,4,5,6,7,8,9

Host plants:
Astragalus
Astragalus adsurgens
Astragalus miser
Astragalus trichopodus lonchus
Astragalus trichopodus
Hedysarum boreale
Lathyrus
Lathyrus carolina
Lathyrus couperi
Lathyrus japonicus
Lathyrus jepsonii californicus
Lathyrus ochroleucus
Lathyrus venosus
Lotus scoparius
Lotus unifoliatus unifoliatus
Lupinus
Lupinus ammophilus
Lupinus arboreus
Lupinus arcticus subalpinus
Lupinus argenteus
Lupinus bakeri amplus
Lupinus bakeri
Lupinus caudatus
Lupinus densiflorus glareosus
Lupinus parviflorus floribundus
Lupinus parviflorus
Lupinus polycarpus
Lupinus polyphyllus superbus
Lupinus sericeus
Lupinus succulentus
Lupinus versicolor
Medicago sativa
Melilotus officinalis
Oxytropis lambertii
Thermopsis rhombifolia divaricarpa
Thermopsis rhombifolia montana
Vicia
Vicia americana
Vicia caroliniana
Vicia cracca
Vicia nigricans gigantea
Vicia sativa
Vicia villosa

PD image courtesy of
Hendron Jane, USFWS

CC0 images courtesy of
Alan Schmierer

CC 2.0 image courtesy of
Aaron Carlson