Diversity of growth forms

The genus contains globose, flattened and elongated stems, solitary or strongly branched. Roots may be fibrous or thickened. Stem surfaces can be green, greyish or covered with pale wax. In some species, only a small part of the plant projects above ground, while others form clusters of many stems reaching about 2 m in diameter. [Larridon et al. 2015, p. 1506–1508]

Flowers arise in the apical zone of the stem and open during the day. Yellow tepals predominate in most species. Differences include the length and shape of the nectar chamber, hairiness of the pericarpel and flower size. The fruits of many species open at the apex, exposing black, glossy seeds. Ants have been observed carrying them in the field. [Larridon et al. 2015, p. 1507–1508]

The Atacama and the fog zone

The 2015 review gives a range from near Tocopilla to the Choapa hills, approximately between 22° and 31°20′ south, from sea level to about 1300 m. Rainfall, fog frequency and slope aspect vary across this broad belt. Variation in conditions favours local ranges and different stem and root forms. [Larridon et al. 2015, p. 1506–1508]

Dew collection by spines and directional transport of droplets have been studied in some taxa. In others, northward inclination and the radiation balance were analysed. Results retain the identity of the plant studied, the location and the conditions. The articles on dew transport and on stem orientation present these mechanisms separately. [Malik et al. 2016] [Ehleringer et al. 1980]

Names and classification

POWO accepts 39 species of Copiapoa as checked on 9 October 2026. The 2015 analysis by Larridon and colleagues used an earlier taxonomic circumscription and combined chloroplast data with morphology. In the 2025 classification by de Vos and colleagues, the genus forms a separate tribe, Copiapoeae, within Cactoideae. [2-WWW] [Larridon et al. 2015] [de Vos et al. 2025]

Data reported in the literature under C. haseltoniana or C. cinerea var. haseltoniana are discussed under C. gigantea. The historical C. columna-alba has a profile under C. cinerea subsp. columna-alba. Current names appear at the start of descriptions, while older names remain in parentheses and in the search index. [Larridon et al. 2018] [2-WWW]

Ecology and conservation

In a study published in 2024, the results section assigned 34 of the 37 taxa assessed to CR, EN or VU categories. This corresponds to about 92%. The analysis included units of different ranks and a specific circumscription of names used at the time. The article on extinction risk gives the numbers in each category, the data collection method and the significance of trade pressure. [Villalobo-Lopez et al. 2024, pp. 6–7]

The 2026 study describes relationships of 19 species with organisms that visit flowers, consume tissues, transport seeds and use stems as shelter. This range of interactions is presented in the article on Copiapoa as a habitat structure. [Cordero et al. 2026, abstract]