Biology:Rauhocereus
Rauhocereus is a monotypic genus of cacti (family Cactaceae). Its only species is Rauhocereus riosaniensis,[1] which has nocturnal flowers.[2] It is known from northern Peru (Rio Santa, Rio Zana, Chamaya and Jaén).
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. 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.[3]
Taxonomy
The genus and its only species were first described in 1957 by Curt Backeberg.[1] As of October 2023[update], Plants of the World Online accepted two subspecies:[4]
- Rauhocereus riosaniensis subsp. jaenensis (Rauh) Ostolaza
- Rauhocereus riosaniensis subsp. riosaniensis
Hybrids
× Raustoa
A hybrid of Rauhocereus riosaniensis subsp. Jaenensis and Espostoa superba is found in Jaén, Peru. [5]
Distribution
References
- ↑ 1.0 1.1 "Rauhocereus Backeb" (in en). Royal Botanic Gardens, Kew. http://www.plantsoftheworldonline.org/taxon/295613-2.
- ↑ Marcelo-Peña, J. L.; Huamantupa, I.; Särkinen, T.; Tomazello, M. (2016). "IDENTIFYING CONSERVATION PRIORITY AREAS IN THE MARAÑÓN VALLEY (PERU) BASED ON FLORISTIC INVENTORIES" (in en). Edinburgh Journal of Botany 73 (1): 95–123. doi:10.1017/S0960428615000281. ISSN 1474-0036. https://journals.rbge.org.uk/ejb/article/view/1597.
- ↑ Anderson, Edward F.; Eggli, Urs (2005) (in de). Das grosse Kakteen-Lexikon. Ulmer. p. 558. ISBN 3-8001-4573-1.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedPOWO_217892-2 - ↑ Ritter, Fredrick (1981) (in De). Kaktten in Südamerika 4. pp. 1343, 1515.
External links
Data related to Rauhocereus at Wikispecies
Wikidata ☰ {{{from}}} entry
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