Status:  common resident

Flights:  1, Feb-Jun

Distribution/known sites in Monterey County:  everywhere except apparently SE county

Habitats:  open areas, incl. meadows, foothills, grasslands, brushlands, forest edge

Host plants: lupines, Lotus scoparius (deerweed), vetches, other legumes

Adult foodflower nectar, incl. Asteraceae; males take minerals in damp areas

Conservation: some pops./ssp. extinct or nearly so.


  1.   forms small, isolated, differentiated pops.

  2.   nine ssp. recognized

  3.   in east, has moved north along hiway corridors

  4.   ssp. xerces (Xerces blue) extinct due to 1943 expansion of military facility in SF; had white spots UN, may have been full species; named by Boisduval for persian king murdered by Greek army

  5.   male bright blue, silvery veins FW above; fem. dark blue-brown, wide borders


Silvery blue Glaucopsyche lygdamus

Life history facts

egg: laid singly on flower buds, young leaves of host plant

larva: feed on flowers, young leaves, seed pods; tended by ants (myrmecophilous)

pupa: hibernates

adult:  males patrol near ground seeking females, which fly near host plant

male courting female