| Rapicactus | |
|---|---|
| |
| Rapicactus zaragosae | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Spermatophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Caryophyllales |
| Family: | Cactaceae |
| Subfamily: | Cactoideae |
| Tribe: | Cacteae |
| Genus: | Rapicactus Buxb. & Oehme |
| Type species | |
| Rapicactus subterraneus | |
| Species | |
|
See text. | |
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
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Species
As of May 2024, 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) |
References
References
- Vázquez-sánchez, Monserrat; Sánchez, Daniel; Terrazas, Teresa; De La Rosa-Tilapa, Alejandro & Arias, Salvador (2019), "Polyphyly of the iconic cactus genus Turbinicarpus (Cactaceae) and its generic circumscription", Botanical Journal of the Linnean Society, 190 (4): 405–420, doi:10.1093/botlinnean/boz027
- "Rapicactus Buxb. & Oehme", International Plant Names Index (IPNI), Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens, retrieved 2022-03-05
- Hunt, D.R. (2016), CITES Cactaceae checklist (3rd ed.), Kew: Royal Botanic Gardens and D. Hunt, ISBN 978-0-9933113-2-1
- "Rapicactus Buxb. & Oehme", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2022-03-07