# Rauhocereus

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Genus of plant

Rauhocereus Rauhocereus riosaniensis in cultivation Conservation status Least Concern (IUCN 3.1)[1] 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: Rauhocereus Backeb.[2] Species: R. riosaniensis Binomial name Rauhocereus riosaniensis Backeb.[2] Synonyms[3] Browningia riosaniensis (Backeb.) G.D.Rowley

***Rauhocereus*** is a [monotypic](/source/Monotypic_taxon) [genus](/source/Genus) of [cacti](/source/Cactus) ([family](/source/Family_(taxonomy)) Cactaceae). Its only species is ***Rauhocereus riosaniensis***,[2] which has [nocturnal flowers](/source/Night-blooming_cereus).[4] It is known from northern [Peru](/source/Peru) ([Rio Santa](/source/Santa_River), [Rio Zana](https://en.wikipedia.org/w/index.php?title=Rio_Zana&action=edit&redlink=1), [Chamaya](https://en.wikipedia.org/w/index.php?title=Chamaya&action=edit&redlink=1) and [Jaén](/source/Ja%C3%A9n%2C_Peru)).

## Description

The mostly shrubby *Rauhocereus riosaniensis*, usually branching from the ground, often forms thickets up to 4 meters high. The upright, columnar shoots are bluish-green and have a diameter of 8 to 15 cm (3.1 to 5.9 in). The 5 to 6 ribs are broken up into many warts. 2 to 8 strong spines, up to 5 cm (2.0 in) long, emerge from the woolly [areoles](/source/Areoles). The lower ones are initially reddish, the upper ones yellowish. Later all become greyish-white.

The bell-shaped flowers appear near the shoot tip. They open at night, are 8 to 10 cm (3.1 to 3.9 in) long and have a diameter of up to 5 cm (2.0 in). The flower cup and the flower tube are covered with small scales and curly brown hairs.

The red, fleshy fruits are ovoid with a persistent flower rest. They contain small, ovoid, shiny black seeds.[5]

## Taxonomy

The genus and its only species were first described in 1957 by Curt Backeberg.[2] As of October 2023[\[update\]](https://en.wikipedia.org/w/index.php?title=Rauhocereus&action=edit), [Plants of the World Online](/source/Plants_of_the_World_Online) accepted two subspecies:[3]

- *Rauhocereus riosaniensis* subsp. *jaenensis* (Rauh) Ostolaza

- *Rauhocereus riosaniensis* subsp. *riosaniensis*

### Hybrids

#### × Raustoa

Main article: [× Raustoa](/source/%C3%97_Raustoa)

A hybrid of Rauhocereus riosaniensis subsp. Jaenensis and [Espostoa superba](https://en.wikipedia.org/w/index.php?title=Espostoa_superba&action=edit&redlink=1) is found in [Jaén, Peru](/source/Ja%C3%A9n_province%2C_Peru). [6]

## Distribution

*Rauhocereus riosaniensis* is found in northern Peru in the Amazonas and Cajamarca regions at altitudes of 500 to 1000 meters.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## References

1. **[^](#cite_ref-IUCN_Red_List_of_Threatened_Species_2011_p._1-0)** ["The IUCN Red List of Threatened Species"](https://www.iucnredlist.org/en). *IUCN Red List of Threatened Species*. 2011-05-07. Retrieved 2023-08-19.

1. ^ [***a***](#cite_ref-POWO_295613-2_2-0) [***b***](#cite_ref-POWO_295613-2_2-1) [***c***](#cite_ref-POWO_295613-2_2-2) [***d***](#cite_ref-POWO_295613-2_2-3) ["*Rauhocereus* Backeb"](https://powo.science.kew.org/taxon/295613-2). *[Plants of the World Online](/source/Plants_of_the_World_Online)*. [Royal Botanic Gardens, Kew](/source/Royal_Botanic_Gardens%2C_Kew). Retrieved 2023-08-19.

1. ^ [***a***](#cite_ref-POWO_217892-2_3-0) [***b***](#cite_ref-POWO_217892-2_3-1) ["*Rauhocereus riosaniensis* Backeb."](https://powo.science.kew.org/taxon/217892-2) *[Plants of the World Online](/source/Plants_of_the_World_Online)*. [Royal Botanic Gardens, Kew](/source/Royal_Botanic_Gardens%2C_Kew). Retrieved 2023-10-16.

1. **[^](#cite_ref-4)** Marcelo-Peña, J. L.; Huamantupa, I.; Särkinen, T.; Tomazello, M. (2016). ["IDENTIFYING CONSERVATION PRIORITY AREAS IN THE MARAÑÓN VALLEY (PERU) BASED ON FLORISTIC INVENTORIES"](https://journals.rbge.org.uk/ejb/article/view/1597). *Edinburgh Journal of Botany*. **73** (1): 95–123. [doi](/source/Doi_(identifier)):[10.1017/S0960428615000281](https://doi.org/10.1017%2FS0960428615000281). [ISSN](/source/ISSN_(identifier)) [1474-0036](https://search.worldcat.org/issn/1474-0036).

1. **[^](#cite_ref-Anderson_Eggli_2005_p._558_5-0)** Anderson, Edward F.; Eggli, Urs (2005). *Das grosse Kakteen-Lexikon* (in German). Ulmer. p. 558. [ISBN](/source/ISBN_(identifier)) [3-8001-4573-1](https://en.wikipedia.org/wiki/Special:BookSources/3-8001-4573-1).

1. **[^](#cite_ref-6)** Ritter, Fredrick (1981). *Kaktten in Südamerika 4* (in German). pp. 1343, 1515.

## External links

- Media related to [*Rauhocereus*](https://commons.wikimedia.org/wiki/Category:Rauhocereus) at Wikimedia Commons

- Data related to [*Rauhocereus*](https://species.wikimedia.org/wiki/Rauhocereus) at Wikispecies

Taxon identifiers Rauhocereus Wikidata: Q8182275 Wikispecies: Rauhocereus CoL: 63QJ6 GBIF: 7282701 GRIN: 16243 iNaturalist: 442926 IPNI: 295613-2 IRMNG: 1095665 ITIS: 906984 NCBI: 153891 Open Tree of Life: 819454 POWO: urn:lsid:ipni.org:names:295613-2 Tropicos: 40022917 WFO: wfo-4000032599 Rauhocereus riosaniensis Wikidata: Q148553 Wikispecies: Rauhocereus riosaniensis CoL: 4RM8V GBIF: 7282702 iNaturalist: 442927 IPNI: 217892-2 ITIS: 908399 IUCN: 151741 NCBI: 153892 Open Tree of Life: 819447 POWO: urn:lsid:ipni.org:names:217892-2 Species+: 17731 Tropicos: 5101472 WFO: wfo-0001287612

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