Early-flowering species on sandy flats, cliff ledges, rock outcrops and other dry open sites at low elevation. Scattered from southwestern BC south to California (Pojar and MacKinnon, 1994).
Coarse textured and well drained.
Low nutrient status.
Neutral to mildly alkaline pH.
Dry to fresh.
Early seral on moister sites, climax on dry exposed sites.
Dry rocky sites in Garry-oak ecosystems.