Rauhocereus is a monotypic genus of cacti (family Cactaceae). Its only species is Rauhocereus riosaniensis,[2] which has nocturnal flowers.[4] It is known from northern Peru (Rio Santa, Rio Zana, Chamaya and Jaén).
| Rauhocereus | |
|---|---|
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| Rauhocereus riosaniensis in cultivation | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Subfamily: | Cactoideae |
| Tribe: | Cereeae |
| Subtribe: | Trichocereinae |
| Genus: | Rauhocereus Backeb.[2] |
| Species: | R. riosaniensis
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| Binomial name | |
| Rauhocereus riosaniensis Backeb.[2]
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| Synonyms[3] | |
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Description
editThe 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. 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
editThe genus and its only species were first described in 1957 by Curt Backeberg.[2] As of October 2023[update], Plants of the World Online accepted two subspecies:[3]
- Rauhocereus riosaniensis subsp. jaenensis (Rauh) Ostolaza
- Rauhocereus riosaniensis subsp. riosaniensis
Distribution
editRauhocereus riosaniensis is found in northern Peru in the Amazonas and Cajamarca regions at altitudes of 500 to 1000 meters.[citation needed]
References
edit- ^ "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. 2011-05-07. Retrieved 2023-08-19.
- ^ a b c d "Rauhocereus Backeb". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-08-19.
- ^ a b "Rauhocereus riosaniensis Backeb." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-10-16.
- ^ Marcelo-Peña, J. L.; Huamantupa, I.; Särkinen, T.; Tomazello, M. (2016). "IDENTIFYING CONSERVATION PRIORITY AREAS IN THE MARAÑÓN VALLEY (PERU) BASED ON FLORISTIC INVENTORIES". Edinburgh Journal of Botany. 73 (1): 95–123. doi:10.1017/S0960428615000281. ISSN 1474-0036.
- ^ Anderson, Edward F.; Eggli, Urs (2005). Das grosse Kakteen-Lexikon (in German). Ulmer. p. 558. ISBN 3-8001-4573-1.
External links
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Media related to Rauhocereus at Wikimedia Commons
Data related to Rauhocereus at Wikispecies
