Genus account · Cactaceae

Eriosyce

Eriosyce Phil.

South American cacti whose similar stems and flowers conceal numerous distinct evolutionary lineages. Studies of DNA, seeds and pollination connect their diversity with the geography of Chile [Guerrero et al. 2019] [Walter et al. 2024].

3 min readUpdated 21 October 2026

All accepted species in the genus Eriosyce ↗

Generic limits and structural diversity

Eriosyce belongs to the cactus family and occurs in western and southern South America. Plants of the World Online accepts a broad circumscription that includes the former genera Neoporteria, Horridocactus and Pyrrhocactus. This group encompasses small plants partly buried in the ground, globose plants and plants that elongate with age. Roots, ribs, flowers and fruits provide characters useful for recognizing individual lineages [2-WWW] [Guerrero et al. 2019].

The 2019 analysis included 63 taxa of the genus and 19 outgroup representatives. Four plastid DNA regions and one nuclear region were compared. Seven principal clades, groups descending from common ancestors, emerged with differing support for individual branches. Some earlier groups based on appearance were scattered across the relationship tree. Similar adaptations to dry habitats may have evolved independently [Guerrero et al. 2019].

Recognizing closely related species

The former E. curvispina complex illustrates the value of combining different evidence. Population research in 2022 revealed genetic structure, and the 2024 revision connected distinct lineages with morphology and the type material of historical names. Nine species were recognized. Identification combines spine arrangement, areole size, flower colour and structure, and seed-coat sculpture. An accurate locality helps relate these features to the appropriate population [Villalobos-Barrantes et al. 2022] [Walter et al. 2024].

Flowers and pollinator access

Funnel-shaped flowers in some species allow bees to collect pollen, whereas tubular flowers in other members of the genus receive hummingbird visits. Reliance on animals can accompany self-incompatibility, a reduced ability to produce seeds after receiving their own pollen. In E. coimasensis, researchers compared hand pollination and hummingbird access in plants beneath shrubs and in open microsites. Seed production was lower beneath shrubs despite larger stems [Guerrero et al. 2019] [Cádiz-Véliz et al. 2021].

In the montane population at Lomas del Viento studied under the historical name E. curvispina, flowers opened over about three days, yet their cumulative fully expanded period was approximately ten hours. A flower contained more than 5 g of water on average. The study addresses the investment in hydrated tissues, and its measurements describe water content at a particular moment. The daily rate of floral water loss remains a separate question. The name used in this experiment predates the 2024 revision of the complex [Cuartas-Domínguez et al. 2022] [Walter et al. 2024].

Seeds and conservation of distinct populations

A comparison of E. subgibbosa and E. villosa revealed different germination responses to temperature and water availability. Such experiments describe an early life stage that determines the appearance of new individuals. Conservation also requires recognition of distinct local lineages. After a broadly defined species is divided, the small range of one lineage may reveal a vulnerability previously hidden within a combined distribution map [Guerrero et al. 2016] [Walter et al. 2024].

Hidden diversity in Eriosyce. DNA, geography and pollinators in species recognition

Synonyms and names in the literature

Neoporteria · Horridocactus · Pyrrhocactus · Islaya · Thelocephala [2-WWW]

Related plant cards

Eriosyce curvispinaEriosyce coimasensisEriosyce subgibbosaEriosyce villosa

Created 21 October 2026

Last modified 21 October 2026

Species and subspecies of the genus

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Species account

Eriosyce aconcaguensis

A globose cactus from the Aconcagua Valley with yellow funnel-shaped flowers and strong spines that become grey. The 2024 revision recognized it at species rank [Walter et al. 2024].

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Eriosyce andicola

A montane member of the former Eriosyce curvispina complex, recognized in part by slender, two-coloured spines and yellowish flowers [Walter et al. 2024].

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Eriosyce choapensis

A small cactus of inland Coquimbo localities, with short spines and pale flowers bearing a pink style [Walter et al. 2024].

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Eriosyce curvispina

A yellow-flowered cactus from central Chile with strong upward-curving spines. Its current circumscription is narrower than the former complex bearing the same name [Walter et al. 2024].

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Eriosyce grandiflora

A montane species around Santiago, distinguished by large red flowers and strong spines. The revision assigned the Farellones populations to it [Walter et al. 2024].

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Eriosyce horrida

A cactus of low coastal hills in Valparaíso, with pink or red flowers and stout spines that turn grey with age [Walter et al. 2024].

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Eriosyce mutabilis

A coastal species around Los Vilos and Los Molles, with variable stem colour, a tendency to branch and pale flowers marked by a reddish stripe [Walter et al. 2024].

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Eriosyce orientalis

A species around Putaendo with a pale stem and flowers whose outer parts are dark purple. Its small localities also include the surroundings of dry riverbeds [Walter et al. 2024].

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Eriosyce robusta

A strongly spined cactus of the La Campana area, with broad ribs and large areoles. The Ocoa population is an important example of genetic distinctness in the former Eriosyce curvispina complex [Villalobos-Barrantes et al. 2022] [Walter et al. 2024].

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Eriosyce coimasensis

A narrowly distributed cactus of central Chile whose tubular flowers receive giant hummingbird visits. Research shows how surrounding shrubs influence pollinator access and seed production [Cádiz-Véliz et al. 2021].

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Eriosyce subgibbosa

A central Chilean species also associated with cooler, wetter conditions than many other Eriosyce. Germination research explains part of this habitat differentiation [Guerrero et al. 2016].

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Eriosyce villosa

A cactus of coastal Chile studied as a representative of the dry end of habitat variation in the Neoporteria lineage. Its seeds illustrate the importance of available water during germination [Guerrero et al. 2016].

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Sources for this account

[2-WWW]Source website

Plants of the World Online — Royal Botanic Gardens, Kew

https://powo.science.kew.org/

Accepted names, synonyms and distribution. A citation beside a taxon leads to its record.

Accessed 2026-10-08.

Article2019

Molecular phylogeny of the large South American genus Eriosyce (Notocacteae, Cactaceae): Generic delimitation and proposed changes in infrageneric and species ranks

Guerrero P. C., Walter H. E., Arroyo M. T. K., Peña C. M., Tamburrino I., De Benedictis M., Larridon I., Molecular phylogeny of the large South American genus Eriosyce (Notocacteae, Cactaceae): Generic delimitation and proposed changes in infrageneric and species ranks, Taxon, 2019, 68(3):557-573, doi: 10.1002/tax.12066

An analysis of four plastid markers and one nuclear marker includes 63 Eriosyce taxa and 19 outgroup representatives. The authors evaluate generic limits and internal classification, identify disagreements between previous morphological treatments and relationships, and propose nomenclatural changes. Seven principal clades receive varying levels of support.