{{Short description|Genus of cacti}} {{Use dmy dates|date=March 2025}} {{Automatic taxobox | image = Arrojadoa penicillata.jpg | image_caption = ''Arrojadoa penicillata'' | display_parents = 2 | taxon = Arrojadoa | authority = [[Nathaniel Lord Britton|Britton]] & [[Joseph Nelson Rose|Rose]], (1920) | synonyms = *''Arrojadoopsis'' <small>Guiggi</small> *''Viridicereus'' {{small|Guiggi}} | synonyms_ref = <ref name=POWO_297007-2/> | subdivision_ranks = Species | subdivision = [[#Species|See text]].| }}
'''''Arrojadoa''''' is a [[genus]] of [[cactus|cacti]], comprising 9 [[species]].<ref name =POWO_297007-2/> It is named after the Brazilian botanist [[Miguel Arrojado Lisboa]] (1872–1932) who was superintendent of the Brazilian Railways at the time that Britton and Rose described the genus in 1920.<ref>{{Cite web|url=http://www.cactiguide.com/cactus/?genus=Arrojadoa|title = On-line Guide to the positive identification of Members of the Cactus Family}}</ref> The genus occurs only in northern Brazil and is found at rocky places, under [[shrub]]s, which support their frail stalk. They are [[subtropical]] plants, with very little frost tolerance.
==Description== The species often have frail stalks that can be upright or procumbent, reaching 2 m high and about 2 to 5 cm thick. There are from 10 to 15 ribs, and ramifications are rare, and usually occur from the base.
The [[flower]]s are nocturnal and tube-like, measuring 1 to 3 cm in length and 0.5 to 1 cm in diameter. Flower colors can be pink or carmine. The fruit is [[Berry (botany)|berry]]-like, spherical with a maximal diameter of 1.5 cm, and pink or red when ripe.
==Species== {{As of|2025}}, [[Plants of the World Online]] accepted the following species:<ref name=POWO_297007-2>{{Cite POWO|title=''Arrojadoa'' Britton & Rose|id=297007-2|access-date=13 August 2025|mode=cs1}}</ref> (The species ''Arrojadoa luetzelburgioides'' described in 2024<ref>{{Cite journal |last1=Taylor |first1=Nigel P. |last2=Zappi |first2=Daniela C. |last3=Ligório Sant'Ana |first3=Afonso Maria de |title=Arrojadoa luetzelburgioides, a new species allied to A. multiflora (Cactaceae) and a key to the recently expanded genus |url=https://bioone.org/journals/bradleya/volume-2024/issue-42/brad.n42.2024.a5/Arrojadoa-luetzelburgioides-a-new-species-allied-to-A-multiflora-Cactaceae/10.25223/brad.n42.2024.a5.short |journal= Bradleya|date=2024 |issue=42 |doi=10.25223/brad.n42.2024.a5 |url-access=subscription }}</ref> was not yet accepted by Plants of the World Online {{As of|2026|January|lc=yes}}.) {| class="wikitable" |- ! Image !! Scientific name!! Distribution |- |||''[[Arrojadoa albiflora]]'' <small>Buining & Brederoo</small> ||Brazil |- |[[File:Arrojadoa dinae Buining & Brederoo.jpg|120px]]||''[[Arrojadoa dinae]]'' <small>Buining & Brederoo</small> ||Brazil |- | [[File:Arrojadoa eriocaulis 1.jpg|frameless|127x127px]]||''[[Arrojadoa eriocaulis]]'' <small>Buining & Brederoo</small> ||Northern Minas Gerais – Brazil |- | |[[Arrojadoa luetzelburgioides|''Arrojadoa luetzelburgioides'']] <small>N.P.Taylor & Zappi</small> |Bahia |- |[[File:Arrojadoa marylaniae.jpg|120px]]||''[[Arrojadoa marylaniae]] <small>Soares Filho & M.Machado</small>''||Bahia, Minas Gerais – Brazil |- | [[File:Arrojadoa multiflora F.Ritter with fruits Bahia Brasil.jpg|frameless|176x176px]]||''[[Arrojadoa multiflora]]'' <small>F.Ritter</small> ||Bahia – Brazil |- | ||''[[Arrojadoa olsthoorniana]]'' <small>Hofacker, M.Machado & R.Pontes</small> ||south Bahia – Brazil |- |[[File:Arrojadoa penicillata001.jpg|120px]]||''[[Arrojadoa penicillata]]''||Bahia – Brazil |- |[[File:Arrojadoa rhodantha001.jpg|120px]]||''[[Arrojadoa rhodantha]]''||Bahia, Minas Gerais, Piaui – Brazil |}
== Formerly included == *''Arrojadoa aureispina'' = ''Arrojadoa rhodantha'' *''Arrojadoa bahiensis'' = ''[[Pierrebraunia bahiensis]]'' *''Arrojadoa beateae'' = ''Arrojadoa dinae'' *''Arrojadoa canudosensis'' = ''Arrojadoa rhodantha'' *''Arrojadoa eddie-estevesii'' = ''[[Pilosocereus eddie-estevesii]]'' *''Arrojadoa flava'' = ''Pierrebraunia bahiensis'' subsp. ''flava'' *''Arrojadoa heimenii'' = ''Arrojadoa dinae'' *''Arrojadoa hofackeriana'' = ''[[Micranthocereus hofackerianus]]'' *''Arrojadoa horstiana'' = ''Arrojadoa rhodantha'' *''Arrojadoa leucostele'' = ''[[Stephanocereus leucostele]]'' *''Arrojadoa luetzelburgii'' = ''[[Lagenosocereus luetzelburgii]]'' *''Arrojadoa polyantha'' = ''[[Micranthocereus polyanthus]]'' *''Arrojadoa pusilliflora'' = ''[[Floribunda pusilliflora]]'' *''Arrojadoa rosenbergeriana'' = ''[[Arrojadoa eriocaulis]]'' *''Arrojadoa theunisseniana'' = ''Arrojadoa rhodantha'' *''Arrojadoa violaciflora'' = ''[[Viridicereus violaciflorus]]''
== Cultivation == {{cleanup|section|reason=it reads like a manual; see [[WP:NOTMANUAL]].|date=January 2020}} These tropical cacti are ideal for hanging baskets because of their snake like growth, but they are difficult to cultivate. They grow relatively rapidly in good conditions. Propagation is done more by seed than by cuttings. It grows best on slightly humid soil and with plenty of watering from spring to autumn. In winter it should be left without water and at a minimal temperature of 10 °C.<ref>{{Cite web|url=http://www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/4847/Arrojadoa_rhodantha|title = Arrojadoa rhodantha}}</ref>
==References== {{Reflist}} * {{Citation |last=Anderson |first=Edward F. |year=2001 |title=The Cactus Family |location=Pentland, Oregon |publisher=Timber Press |isbn=978-0-88192-498-5 }}
==External links== * {{Commons category-inline|Arrojadoa|''Arrojadoa''}} * {{Wikispecies-inline|Arrojadoa|''Arrojadoa''}} * https://web.archive.org/web/20120602032609/http://www.columnar-cacti.org/arrojadoa/index.html * http://www.cactiguide.com/cactus/?genus=Arrojadoa
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[[Category:Cereeae]] [[Category:Cereeae genera]] [[Category:Cacti of South America]] [[Category:Endemic flora of Brazil]]