C. haseltoniana Backeb. Plant no.15, map 4. KK 69.

Body-branching from base and side, grey green to light grey, hoary. Ribs sometimes flattened, later all flat. Crown brownish; Areoles-large, to 9 mm across; Spines-increasing to about 9 radials, later sloping a little downwards, yellowish, tips sometimes darker, to 3 cm long. 0-1 centrals; Flower-yellow; Habitat-Taltal near Paposo (north of Taltal).

Note: Backeberg believed it could be a natural hybrid with Copiapoa cinerea. 'The Chileans' indicates possibly two forms, one with long translucent spines which has whitish wool, another with deeper coloured, shorter spines, more ribs and has orange wool. See C. cinerea v. haseltoniana (Backeb.) Taylor.

C. haseltoniana v. minor Plant no.11, map 4.

A variety found by Knize (?KK 1384) presumably smaller than the species.

C. hornilloensis Ritt. (Kakt. Sudamer. 1980). R 1149.

Habitat range is Cerro Hornillo north of Esmeralda, Dept. Taltal, Antofagasta. Ritter considers this species to be close to C. rupestris.  

C. humilis (Phil. 1860) Hutch. Plant no.14, map 4. KK 118.

Body-depressed, subglobose, 2( -8) cm high, 2.5( -6) cm across, green to grey, 10-12 tuberculate ribs; Spines-dark brown later grey, 10-12 radials bristly 5-15 mm long. 1-4 centrals, 2.2 cm long; Flower-yellow, 2 cm long; Habitat­Paposo.

Note: This species is said to have huge turnip-like roots. The body size raises a few problems-'The Chileans' say 5-7 cm across, Hutchinson states 4-6 cm high and under South Australian conditions 7-8 cm high. There are three forms shown in Backeberg's 'Die Cactaceae' - one which Hutchinson collected, another Ritter collected and a third that Backeberg obtained. Backeberg considered that his plant was the closest to the original description. The name 'remontana' occurs at odd times, and seems referrable to this species. A form called spiralis occurs, presumably because of spiral ribs. Possibly this is a horticultural name. Taylor (1981) suggests that the following species may be geographical varieties, starting from the north:  C. tocopillana, C. tenuissima, C. variispinata, C. paposoensis, C. taltalensis and C. longispina. See also notes under C. tenuissima.

C. hypogaea Ritt. (1960). Plant no.34, map 5. KK 88A.

Body-single or dividing dichotomously, small to 4 cm across. Brownish-green, 10-14 ribs divided into tubercles; Areoles-sunken; Spines--blackish to ash grey. At first 1-6, 2-4 mm long, later deciduous; Flower-pale yellow, 2.2 cm long to 4 cm across; Fruit-small, whitish with shiny black seeds; Roots-turnip-like; Habitat-coast of the province of Antofagasta.

Note: Knize found KK 88A just south of the province of Antofagasta.