| Glaucopsyche lygdamus oro (Scudder, 1876) |
| Status: Uncommon to common local resident |
| Flight Period(s): There is one spring flight. Nebraska records are from 16 April – 21 June. |
| Range: Subspecies of the Silvery Blue occupy most of the western half of North America from Alaska south through New Mexico and Arizona as well as much of the northern United States and southern Canada east through the New England states and New Brunswick. There are additional disjointed populations in Missouri and Arkansas and in the Appalachians. |
| Larval Hostplant(s): While Astragalus adsurgens, Yellow Vetchling (Lathyrus ochroleucus), Lotus purshianus, Silvery Lupine (Lupinus argenteus), Alfalfa (Medicago sativa), White Sweet Clover (Melilotus alba), Purple Locoweed (Oxytropis lambertii) and Hairy and American Vetches (Vicia villosa and V. americana) are all recognized hostplants occuring in Nebraska only Slender Milkvetch (Astragalus gracilis) has been verified as a hostplant in the state. |
| Overwinter: As pupae |
| Commentary/Habitat: In Nebraska this species has long been found in Pine Ridge grasslands and rocky hillside prairies of the panhandle. Recently (in the last 20 years) it has also been discovered in the loess hills of the southcentral and southwestern Nebraska, where it is proving to be quite widespread. It is often common in the panhandle, where it flies in early June, often with Boisduval’s Blue. It is somewhat less numerous in the loess hills where it’s flight is usually completed by mid May. |
| Similar Species: Boisduval’s Blue. |
