Corryocactus

Range and current genus circumscription

Plants of the World Online accepts 16 species of Corryocactus. The genus occurs naturally in Peru, Bolivia and northern Chile. Its synonyms include Erdisia, a former name for some smaller cacti with slender stems. Its presence in older literature describes a historical division of what is now the same genus. [2-WWW]

In 2025, C. volcanicus was described from the Andagua Valley in southern Peru. In current POWO, it is a separate accepted species. Its similarity in appearance to C. brevistylus requires comparison of flowers, fruits and seeds. Long spines and columnar growth alone provide too few features to distinguish these plants. [Pauca-Tanco and Hoxey 2025] [2-WWW]

Different sizes and branching patterns

The genus includes shrubs and plants with a tree-like growth form. Stems have distinct ribs and spine-bearing areoles. Flowers are funnel-shaped, with a short, thick tube, scales and hairs on their outer parts. Spherical fruits may retain spines during development, and some species have seeds surrounded by a mucilaginous covering. [Ostolaza Nano 2014, p. 442]

Branches may arise at the base of a columnar stem or within a system of underground stems. The latter pattern was described in C. aureus. The Arequipa field catalogue presents it as a shrub with erect stems occurring in dry valleys, scrub and on rocky slopes. Growth form and habitat features therefore differ even among well-documented species. [Pauca Tanco and Quipuscoa Silvestre 2017, p. 454]

Seeds responding to light

In Jara-Peña and colleagues' experiment, seeds of C. aureus and C. brevistylus from Arequipa germinated under illumination and remained ungerminated in darkness throughout the test. Each treatment included five dishes of 25 seeds. Incubation lasted 30 days, at temperatures of 18–25°C with a 12-hour photoperiod. The result indicates positive photoblastism in these two tested batches, meaning stimulation of germination by light. [Jara-Peña et al. 2024, p. 6, Table 2]

Illumination in the germination chamber was an experimental factor, while subsequent seedling survival in the habitat remained outside its scope. The sample included two species of the genus. The response of other Corryocactus members requires their own data, as do the effects of light quality, temperature and seed age. [Jara-Peña et al. 2024, Materials and methods, Results]

A parasitic plant and host tissues

C. brevistylus is a host of Ligaria cuneifolia in the family Loranthaceae. Its green, leafy shoots emerge outside the cactus, while the internal part remains close to the stem surface. The parasite uses vascular bundles located in the primary cortex. In the tissues studied, formation of new bundles, wood growth and responses limiting contact between the two plants were observed. [Mauseth et al. 2015, p. 6–12]

The study concerned C. brevistylus in detail. It describes its response to a particular parasitic plant and allows the way persistent, photosynthetic parenchyma can change its developmental direction to be followed. The structure of this relationship is explored in “Ligaria inside a cactus. Restructuring of Corryocactus tissues”. [Mauseth et al. 2015]

Propagation using an intact stem

A nursery experiment on C. brevistylus compared cuttings retaining a larger part of the stem with cylindrical and longitudinally split fragments. Survival at the final stage of the trial was highest in the first treatment. The experiment's scope and detailed differences in fragment preparation are described in the species account. The result applies to the entire protocol used, including substrate type and the period allowed for wounds to dry. [Trevizan Rispoli and Baltierra Chipana 2018, p. 113–116]

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