Ceanothus tomentosus var. tomentosus
Leaf-blades: margins serrulate, abaxial surface uniformly and densely tomentulose, veins obscured. 2n = 24.
Phenology: Flowering Mar–May.
Habitat: Open sites, chaparral, oak-pine woodlands.
Elevation: 100–1600 m.
Variety tomentosus is restricted to the western slope of the Sierra Nevada, from Nevada County south to Mariposa County. A rare, low-growing form with spreading stems occurs on nutrient-poor, sandy soils of the Ione Formation in Amador County.
"thin" is not a number.