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Genus of cactus From Wikipedia, the free encyclopedia
Rapicactus is a genus of cactus in the tribe Cacteae, subfamily Cactoideae. It has been synonymized with Turbinicarpus but molecular phylogenetic studies have supported its monophyly and separation from that genus.[1]
Rapicactus | |
---|---|
Rapicactus zaragosae | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Caryophyllales |
Family: | Cactaceae |
Subfamily: | Cactoideae |
Tribe: | Cacteae |
Genus: | Rapicactus Buxb. & Oehme |
Type species | |
Rapicactus subterraneus | |
Species | |
See text. |
The genus Rapicactus was proposed in 1942 by Buxbaum and Oehme.[2] It was characterized by having thick roots with a constriction above forming a neck. However, most subsequent treatments sank the genus into a broadly circumscribed genus Turbinicarpus. The circumscription of Turbinicarpus has been described as "remarkably unstable", with species regularly transferred to other genera.[1] The broad circumscription of Turbinicarpus was recognized as polyphyletic by Hunt in 2016.[3] A phylogenetic study published in 2019 showed that a monophyletic Rapicactus was sister to Acharagma, separated from a monophyletic Turbinicarpus:[1]
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As of May 2024[update], Plants of the World Online accepted four species:[4]
Image | Scientific name | Distribution |
---|---|---|
Rapicactus beguinii (N.P.Taylor) Lüthy | NE. Mexico | |
Rapicactus booleanus (G.S.Hinton) D.Donati | Mexico (Nuevo León) | |
Rapicactus mandragora (Fric ex A.Berger) Buxb. & Oehme | Mexico (Durango, Coahuila, Nuevo León) | |
Rapicactus subterraneus (Backeb.) Buxb. & Oehme | Mexico (Nuevo León, Tamaulipas, San Luis Potosí) | |
Rapicactus zaragosae (Glass & R.A.Foster) D.Donati | Mexico (Nuevo León, Tamaulipas) | |
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