lupine blue ~ 05/20/14 ~ Pinnacles

lupine blue on California buckwheat
Plebejus lupini on  Eriogonum fasciculatum var. foliolosum
(Shapiro and BugGuide discussion)
Polygonaceae

edited 08/15/14 - I initially wrote a bunch of hooey about bloom times and timing of butterflies, which I've deleted for how utterly ignorant it was, and once again I've changed my mind about this ID from acmon back to lupini.  I tend to think of the non-early-spring female acmon as definitely having a true brown ground color, which this does not have.  Determination of female or male is still up in the air, because I've been told that male lupini can be quite dark like this (e.g., series of P. lupini monticola plates).  My understanding is the whole group of acmon/lupini is currently being revised.  So, for now, I can only make my best guess.