Ceanothus megacarpus var. insularis
Bull. S. Calif. Acad. Sci. 31: 68. 1932.
Leaves mostly opposite; petiole 2–5 mm; blades oval to elliptic, 15–30 × 10–18 mm. Capsule: valves smooth; horns weakly developed or absent.
Phenology: Flowering Feb–Apr.
Habitat: Rocky slopes, canyons, chaparral.
Elevation: 10–500 m.
Variety insularis occurs on the California Channel islands and at several isolated localities in the Santa Monica and Santa Ynez mountains.
"thick" is not a number.