# Acanthocalycium

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Genus of plants from Argentina

Acanthocalycium Acanthocalycium spiniflorum Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade: Spermatophytes Clade: Angiosperms Clade: Eudicots Order: Caryophyllales Family: Cactaceae Subfamily: Cactoideae Tribe: Cereeae Subtribe: Trichocereinae Genus: Acanthocalycium Backeb.[1] Type species Acanthocalycium spiniflorum Species See text.

***Acanthocalycium*** is a [genus](/source/Genus) of [cactus](/source/Cactus) consisting of several species from [Argentina](/source/Argentina), [Bolivia](/source/Bolivia), [Brazil](/source/Brazil), [Paraguay](/source/Paraguay) and [Uruguay](/source/Uruguay).[1] The taxon name comes from [Greek](/source/Greek_language) *akantha* (meaning *prickly*) and *kalyx* (meaning *buds*), which refers to the spines on the [floral tubes](/source/Floral_tube).[2]

## Description

These plants are [globose](https://en.wiktionary.org/wiki/globose) to [elongate](https://en.wiktionary.org/wiki/elongate), with numerous ribs on the spiny [stems](/source/Plant_stem) columnar stem succulents up to 60 cm high and 20 cm in diameter. The plants usually remain unbranched or branch slightly from the bases. The areoles, which stand on up to 20 ribs, have many spines up to about 8 cm long, which are only indistinctly divided into edge and central spines.

[Flowers](/source/Flower) range from yellow to orange or white to pink or magenta and open during the day. The funnel-shaped flowers, formed by areoles near the apex, have scales on the outside that taper into sharp thorns. This feature is typical of the genus Acanthocalycium and only occurs in it. Inside, the area of the flower containing the ovary (ovary) is protected with a ring of hairs.[3]

## Taxonomy

*Spinicalycium* [Fric](/source/Alberto_Vojtech_Fri%C4%8D) (nom. inval.) has been brought into [synonymy](/source/Synonym_(taxonomy)) with this genus. Besides, the genus *Acanthocalycium* has been periodically included in the genus *[Echinopsis](/source/Echinopsis)*.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

### Species

As of October 2025[\[update\]](https://en.wikipedia.org/w/index.php?title=Acanthocalycium&action=edit), [Plants of the World Online](/source/Plants_of_the_World_Online) accepted the following species:[1]

Image Scientific name Distribution Acanthocalycium klinglerianum (Cárdenas) Lodé Bolivia Acanthocalycium leucanthum (Gillies ex Salm-Dyck) Schlumpb. Argentina Acanthocalycium rhodotrichum (K.Schum.) Schlumpb. E. Bolivia to W. Central Brazil and Uruguay Acanthocalycium spiniflorum (K.Schum.) Backeb. Argentina Acanthocalycium thionanthum (Speg.) Backeb. Argentina

## References

1. ^ [***a***](#cite_ref-POWO_295863-2_1-0) [***b***](#cite_ref-POWO_295863-2_1-1) [***c***](#cite_ref-POWO_295863-2_1-2) ["*Acanthocalycium* Backeb."](https://powo.science.kew.org/taxon/295863-2) *[Plants of the World Online](/source/Plants_of_the_World_Online)*. [Royal Botanic Gardens, Kew](/source/Royal_Botanic_Gardens%2C_Kew). Retrieved 2023-10-10.

1. **[^](#cite_ref-Eggli_Newton_2004_2-0)** Eggli, U.; Newton, L.E. (2004). [*Etymological Dictionary of Succulent Plant Names*](https://books.google.com/books?id=u2n5vusQ1DEC&pg=PA1). Springer Berlin Heidelberg. p. 1. [ISBN](/source/ISBN_(identifier)) [978-3-540-00489-9](https://en.wikipedia.org/wiki/Special:BookSources/978-3-540-00489-9). Retrieved 20 September 2018.

1. **[^](#cite_ref-Anderson_Eggli_Anderson_2005_p._67–68_3-0)** Anderson, Edward F.; Eggli, Urs; Anderson, Edward F. (2005). *Das große Kakteen-Lexikon* (in German). Stuttgart (Hohenheim): Ulmer. p. 67–68. [ISBN](/source/ISBN_(identifier)) [3-8001-4573-1](https://en.wikipedia.org/wiki/Special:BookSources/3-8001-4573-1).

- [Edward F. Anderson](/source/Edward_F._Anderson), *The Cactus Family* (Timber Press, 2001), pp. 105–106

- [Willy Cullmann](https://en.wikipedia.org/w/index.php?title=Willy_Cullmann&action=edit&redlink=1), [Erich Götz](https://en.wikipedia.org/w/index.php?title=Erich_G%C3%B6tz&action=edit&redlink=1) & [Gerhard Gröner](https://en.wikipedia.org/w/index.php?title=Gerhard_Gr%C3%B6ner&action=edit&redlink=1), *The Encyclopedia of Cacti* (Alphabooks, 1086). pp. 124–125

The flower of *Acanthocalycium spiniflorum*

Taxon identifiers Acanthocalycium Wikidata: Q133858 Wikispecies: Acanthocalycium BioLib: 105555 CoL: M3F EoL: 5187213 EPPO: 1AKCG GBIF: 7283711 GRIN: 33 iNaturalist: 773759 IPNI: 295863-2 IRMNG: 1336164 ITIS: 907189 NCBI: 153833 Open Tree of Life: 971063 POWO: urn:lsid:ipni.org:names:295863-2 Tropicos: 40003196 WFO: wfo-4000000096

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Adapted from the Wikipedia article [Acanthocalycium](https://en.wikipedia.org/wiki/Acanthocalycium) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Acanthocalycium?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.