PlantaeDB Logo
Login Sign-up

Genus Pelecyphora in Family Cactaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Pelecyphora (C.Ehrenb.) is a small cactus genus in the family Cactaceae, placed in the subfamily Cactoideae (Anderson, 2001). Two species have been recognized historically, but the current checklist (POWO, 2024) lists only Pelecyphora aselliformis as accepted, while the World Flora Online (WFO, 2024) still treats Pelecyphora strobiliformis as a separate taxon; the type species is Pelecyphora aselliformis (Anderson, 2001). The genus is endemic to limestone outcrops of the Sierra Madre Oriental in central Mexico, occurring in semi‑arid shrubland between 1,200 and 1,800 m altitude (Hernández‑Hernández et al., 2021).

Diagnostic morphology distinguishes Pelecyphora from other cacteae by its globose to shortly columnar stem that bears a tuberous root system, giving the plant an “axe‑shaped” appearance (Anderson, 2001). The stem surface is covered with awl‑shaped spines arranged in a single row per areole, and the leaves are reduced to microscopic scales typical of the family. Flowers are solitary, diurnal, and large, with magenta‑pink tepals and a short, tubular perianth; the ovary is inferior with numerous ovules attached to parietal placentae. The fruit matures as a fleshy berry containing black seeds, an adaptation for endozoochorous dispersal (Anderson, 2001).

Diversity and range are limited. Pelecyphora exhibits a narrow center of endemism in the Mexican states of San Luis Potosí and Nuevo León, with only a few populations recorded per species (WFO, 2024). Its habitat on limestone cliffs and gravelly slopes makes it vulnerable to disturbance.

Taxonomically, the genus has been assigned to the tribe Cacteae and grouped with Astrophytum and Lophophora in molecular phylogenies (Hernández‑Hernández et al., 2021). Historically, two subgenera—subg. Pelecyphora and subg. Parapelecyphora—were recognized (Anderson, 2001), although recent treatments treat it as monotypic. Some authors have proposed merging Pelecyphora into Turbinicarpus, but phylogenetic evidence supports its distinctiveness.

Human relevance is limited to horticultural interest; the compact habit and flowers make Pelecyphora a prized ornamental among cactus collectors, though it is seldom cultivated on a commercial scale.

Conservation concerns are serious: P. aselliformis is listed as Endangered on the IUCN Red List (IUCN, 2022) due to habitat loss from mining and climate change. Continued monitoring of remaining populations and ex situ conservation will be essential for its long‑term persistence.

Pick a Species to see its components: