Opuntia humifusa var. ammophila
Cact. Succ. J. (Los Angeles) 48: 39. 1976.
Shrubs or small trees, erect, to 2 m, often with short trunk, usually oval in cross-section. Stem segments firm.
Phenology: Flowering spring–summer (Feb–Aug).
Habitat: Sand dunes, scrub woodland flats
Elevation: 0-60 m
Opuntia humifusa var. ammophila is poorly known and needs additional ecologic, taxonomic, and molecular study. The distribution given follows L. D. Benson (1982).
"thickish" is not a number.