Rapicactus
Template:Short description Template:Automatic taxobox 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]
Taxonomy
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] Script error: No such module "Clade".
Species
since May 2024[update]Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., Plants of the World Online accepted four species:[4]
| Image | Scientific name | Distribution |
|---|---|---|
| File:Turbinicarpus beguinii .jpg | Rapicactus beguinii (N.P.Taylor) Lüthy | NE. Mexico |
| File:Turbinicarpus booleanus - Flickr - Resenter89.jpg | Rapicactus booleanus (G.S.Hinton) D.Donati | Mexico (Nuevo León) |
| File:Rapicactus mandragora.jpg | Rapicactus mandragora (Fric ex A.Berger) Buxb. & Oehme | Mexico (Durango, Coahuila, Nuevo León) |
| File:Rapicactus subterraneus.jpg | Rapicactus subterraneus (Backeb.) Buxb. & Oehme | Mexico (Nuevo León, Tamaulipas, San Luis Potosí) |
| File:Rapicactus zaragozae.jpg | Rapicactus zaragosae (Glass & R.A.Foster) D.Donati | Mexico (Nuevo León, Tamaulipas) |
References
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