Ceanothus foliosus var. foliosus
Shrubs, 1.5–3.5 m. Stems ascending to erect. Leaf-blades ± folded lengthwise, margins glandular-denticulate, wavy, abaxial surface pale green to grayish green, glabrous, sometimes sparsely puberulent on veins. 2n = 24.
Phenology: Flowering Jan–May.
Habitat: Rocky soils, chaparral, mixed evergreen and conifer forests.
Elevation: 100–1100 m.
Variety foliosus occurs in the outer North Coast Ranges and Santa Cruz Mountains, from Humboldt to Santa Clara counties. H. McMinn (1944) reported putative hybrids with Ceanothus parryi and C. thyrsiflorus.
"thin" is not a number.