Genus

Austrocylindropuntia

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Accepted species of Austrocylindropuntia, its placement in Pterocacteae, generic synonyms, and diagnostic context.

Taxonomic identity of Austrocylindropuntia

Austrocylindropuntia Backeb. is a genus in the subfamily Opuntioideae of Cactaceae. The name was published in 1938 and is accepted by Plants of the World Online.¹ In the current phylogenomic classification it is placed in the predominantly South American tribe Pterocacteae.²

Circumscription of the genus

The 2026 Kew taxonomic backbone lists eight accepted species: A. cylindrica, A. floccosa, A. lagopus, A. lauliacoana, A. pachypus, A. shaferi, A. subulata, and A. vestita.¹ This is not an immutable final species count; it records the current acceptance of a particular maintained backbone. New nomenclatural or phylogenetic evidence may alter how the genus is circumscribed.

The native range of the genus extends from central Colombia to north-western Argentina, broadly following Andean and adjacent regions.¹ Its species have cylindrical segmented stems, conspicuous tubercles, and areoles, but their habits vary. Some are high-elevation cushion plants, whereas others, including A. subulata, can become taller shrubs or small tree-like plants.

Leaves, spines, and areoles

The “cylindro” element in the name refers to cylindrical stem segments. In members such as A. subulata, fleshy leaves arising from the stem are not the same organs as the spines produced by the areoles. Leaf size and persistence can be taxonomically informative. This distinction is important because horticultural names often describe the plant loosely as having “needle leaves.”

Relationships and synonymy

In the 2025 phylogenomic analysis, Cumulopuntia is supported as a close sister lineage to Austrocylindropuntia. The segregate Punotia was also recovered as a strongly supported close relative and is included within Austrocylindropuntia in the current treatment.² The Kew backbone lists Andinopuntia, Peruviopuntia, Pseudotephrocactus, Punotia, and Trichopuntia as heterotypic generic synonyms.¹

Phylogenetic evidence supports the placement of the genus in Pterocacteae, although the earliest branching order within that tribe and the rank of some small segregates are not entirely free from debate. This page follows the current acceptance while retaining alternative names in their historical and nomenclatural context.

References

Plants of the World Online. “Austrocylindropuntia Backeb.” Royal Botanic Gardens, Kew. Accessed: 2026-08-03. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:295177-2 ↩
de Vos, J.M. et al. “Phylogenomics and classification of Cactaceae based on hundreds of nuclear genes.” Plant Systematics and Evolution 311, 28. Accessed: 2026-08-03. https://doi.org/10.1007/s00606-025-01948-z ↩

Child Taxa

Plants In This Group

Austrocylindropuntia cylindrica

Austrocylindropuntia cylindrica is a cylindrical segmented cactus associated with the Andean region of Central Colombia, Ecuador, and north western Peru. It may develop as a shrub or small tree. The ageing main stem can become woody, while dark or bluish green shoots carry conspicuous rhomboid tubercles.

Austrocylindropuntia floccosa

Austrocylindropuntia floccosa is a remarkable cushion forming succulent shrub adapted to the harsh conditions of the high altitude Andean plateaus. It is famous for its dense covering of white, wool like hairs that shield the plant from freezing temperatures and intense solar radiation.

Austrocylindropuntia lagopus

Austrocylindropuntia lagopus is a fascinating high altitude cactus species native to the Andean highlands. Characterized by its dense cushion forming growth habit and a thick blanket of soft, white woolly hairs, this plant is evolutionary designed to withstand extreme cold and intense solar radiation . It is highly sought after by succulent collectors for its unique, cloud like appearance.

Austrocylindropuntia lauliacoana

Austrocylindropuntia lauliacoana is a succulent subshrub in the family Cactaceae, native to the high altitude Andean regions of Peru. Adapted to harsh mountain environments, this species is highly valued by specialized collectors for its unique cylindrical form and defensive spination .

Austrocylindropuntia pachypus

Austrocylindropuntia pachypus is a distinctive and highly sought after columnar cactus species within the Cactaceae family. Developing a shrubby or subshrubby habit in its natural environment, this succulent is greatly valued by collectors for its unique spiraling tubercles and dense spine coverage .

Austrocylindropuntia shaferi

Austrocylindropuntia shaferi is a distinct, shrubby succulent cactus belonging to the family Cactaceae . Characterized by its upright cylindrical stems and prominent spination, this species is highly adapted to arid and semi arid montane environments.

Austrocylindropuntia subulata

Austrocylindropuntia subulata is a cactus native to the dry Andean region of Peru and Bolivia. With age it can become a shrub or small tree like plant. Its upright main stem may become woody, while the green lateral shoots are cylindrical and distinctly tuberculate. Areoles on the tubercles can carry strong spines and minute, irritating glochids.

Austrocylindropuntia vestita

Native to the arid landscapes of the high Andes Mountains in South America, Austrocylindropuntia vestita is a fascinating member of the cactus family (Cactaceae). Also known as "Woolly Opuntia" or "Old Man Opuntia," this plant stands out due to its distinctive appearance. Its stems are typically cylindrical and densely covered with white hairs and spines, giving it a "woolly" or "old man" look. These hairs serve as a natural adaptation mechanism, protecting the plant from both excessive sunlight and freezing temperatures .