Found on the southern half of coastal and interior British Columbia to California. Common on southern Vancouver Island and the Gulf Islands. Also common on the San Juan Islands and west of the Cascades throughout Washington including the Olympics and the Columbia Gorge. Found in very dry to dry sunny areas such as rocky outcroppings, coastal bluffs, cliffs and ravines. Low to middle elevations.
Coarse textured sandy, gravelly soils.
Nitrogen poor soils.
Excessively dry to very dry soils. Abundance decreases with increasing precipitation. Shallow, water shedding sites; characteristic of moisture-deficiency (Klinka et al., 1995).
Very shade intolerant (Klinka et al., 1995).
Climax species on excessively dry, non-forested sites.
Rock outcrops within driest Garry oak communities.