notes NOTE: You may comment on the ID or other aspects of this post at this associated Flickr URL. This plant was part of a population growing mostly in partial shade under burnt or badly charred oaks and bay trees, photographed here during the spring following the Morgan Fire of September, 2013.
It keyed clearly to species Gilia achilleifolia in Ertter & Bowerman's flora for Mt Diablo. Getting to subspecies in that key was also fairly clear.... going with the 2nd choice in the following couplet:
''Flowers mostly solitary on slender pedicels; inflorescense pubescence sparse......G. achilleifolia ssp. multicaulis'' vs.
''Inflorescense of many-flowered clusters; inflorescence pubescence of dense, white, crisped hairs''......[leading to G. achilleifolia ssp. achilleifolia]
However, the above key couplet was ambiguous for another very nearby plant appearing in the related post here. The discussion in a 1954 paper by Verne Grant of the ''sun'' and 'shade'' variants within the species G. achilleifolia may help reconcile things. For details on this, see the remarks in the aforementioned related post here.