Peniocereus

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Peniocereus

Peniocereus (A.Berger) Britton & Rose in Contr. U.S. Natl. Herb. 12: 428. 1909 sec. Franco-Estrada & al. 20211 wfo-4000028539
  • Cereus subsect. Peniocereus A.Berger in Rep. (Annual) Missouri Bot. Gard. 16: 77. 1905 syn. sec. Hunt 20062 wfo-3000003216
    • Nametype: Peniocereus greggii (Engelm.) Britton & Rose
  • 1. Franco-Estrada, D., Sánchez, D., Terrazas, T. & Arias, S. 2021: Phylogenetic analysis of Peniocereus (Cactaceae, Echinocereeae) based on five chloroplast DNA markers. – Brazilian Journal of Botany 44(4): 903-916. 10.1007/s40415-021-00774-0, 2. Hunt, D.R. 2006: The New Cactus Lexicon. – Milborne Port: dh books
  • =Neoevansia W.T.Marshall in Marshall & Bock, Cactaceae: 84. 1941 syn. sec. Hunt 20063 wfo-4000025682
    • Nametype: Neoevansia diguetii (F.A.C.Weber) W.T.Marshall
  • 3. Hunt, D.R. 2006: The New Cactus Lexicon. – Milborne Port: dh books
  • =Cullmannia Distefano in Kakteen And. Sukk. 7: 8. 1956 syn. sec. Hunt 20064 wfo-4000010026
    • Nametype: Cullmannia viperina (F.A.C.Weber) Distefano
  • 4. Hunt, D.R. 2006: The New Cactus Lexicon. – Milborne Port: dh books

Notes

The generic circumscription of Peniocereus was revised based on the molecular phylogenetic study of Arias & al. (2005). Their study based on plastid trnL-F and rpl16 found Peniocereus polyphyletic, its species resolved in three lineages. Peniocereus subg. Pseudoacanthocereus was found to be nested in Acanthocereus, yet both were also paraphyletic. For a classification reflecting these relationships, Peniocereus subg. Pseudoacanthocereus was transferred to Acanthocereus (Lodé 2013; Korotkova & al. 2017). The other major Peniocereus clade found by Arias & al. (2005) corresponds to Peniocereus subg. Peniocereus.
Peniocereus serpentinus, the type species of the earlier-proposed genus Nyctocereus was resolved as a separate lineage reinstating it as a monotypic genus Arias & al. (2005).
Phylogenetic relationships of Peniocereus and its relatives in the Pachycereinae were revisited by Franco-Estrada & a. (2021) using sequences from 5 plastid markers. This study confirmed the circumscription of Peniocereus with 7 species, Pachycereus with 5 species and provided well-supported evidence for the placement of Backebergia and Pterocereus as monotypic genera within the Pachycereinae.A,B,C,D,E

Taxon standing

Category B. The genus is monophyletic based on phylogenetic studies that support the clade based on a sufficiently dense or even complete sampling, or support a monotypic genus as a distinct lineage, but do not provide a new taxonomic treatment at the species level. In many cases, older classical taxonomic synopses or a monographic treatment exist for these genera providing a reliable assessment of the species included.B

Acknowledgments

Revised by Salvador Arias

Bibliography

A. Arias, S., Terrazas, T., Arreola-Nava, H. J., Vázquez-Sánchez & Cameron, K. M. 2005: Phylogenetic relationships in Peniocereus (Cactaceae) inferred from plastid DNA sequence data. – Journal of Plant Research 118(5): 317-328. https://doi.org/10.1007/s10265-005-0225-3
B. Franco-Estrada, D., Sánchez, D., Terrazas, T. & Arias, S. 2021: Phylogenetic analysis of Peniocereus (Cactaceae, Echinocereeae) based on five chloroplast DNA markers. – Brazilian Journal of Botany 44(4): 903-916. https://doi.org/10.1007/s40415-021-00774-0
C. Korotkova, N., Borsch, T. & Arias, S. 2017: A phylogenetic framework for the Hylocereeae (Cactaceae) and implications for the circumscription of the genera. – Phytotaxa 327(1): 1-46. https://doi.org/10.11646/phytotaxa.327.1.1
D. Lodé, J. 2013: New combinations. – Cactus Adventures International Suppl. 98: 2-3
E. Sánchez, D. & Arias, S. 2022: Updates to the Cactaceae species-level checklist for the genera Peniocereus, Pachycereus, Backebergia and Pterocereus. – Published online at https://caryophyllales.org/cactaceae/Checklist.