Ceanothus megacarpus var. megacarpus
Leaves mostly alternate; petiole 1–3 mm; blade oval, elliptic, or oblanceolate, 10–25 (–33) × 5–19 mm. Capsule: valves rugulose to weakly ridged near apex; horns prominent.
Phenology: Flowering Nov–Apr.
Habitat: Rocky slopes, canyons, chaparral.
Elevation: 10–900 m.
Variety megacarpus occurs on coastal slopes of mountains from Santa Barbara County south to San Diego County, and at isolated localities on several California Channel Islands.
"thick" is not a number.