Ceanothus foliosus var. vineatus
Ceanothus, 221. 1942.
Shrubs, 0.3–0.8 m. Stems ascending, arcuate, or prostrate. Leaf-blades flat to ± folded lengthwise, margins entire or weakly denticulate near apex, not to weakly wavy, abaxial surface pale green, glabrous, sometimes sparsely puberulent on veins.
Phenology: Flowering Mar–May.
Habitat: Sandy soils, chaparral.
Elevation: 50–100 m.
Variety vineatus is known only from two localities in Sonoma County.
"thin" is not a number.