Growth form and names
The stem remains low, with tubercles arranged close to ground level. An areolar groove runs along their upper surface. The thick underground part stores water, so the visible rosette's size does not reflect the plant's full size. [Jiménez-Sierra et al. 2022] [Moebius-Goldammer et al. 2003]
Ariocarpus kotschoubeyanus (Lem.) K.Schum. is accepted in POWO. Older combinations and variety names can be found in the atlas index. A collector's name alone establishes neither a separate species nor confirmed specimen provenance. [2-WWW]
Habitat and the role of shelter
The species occurs in northeastern Mexico. Studies from different regions describe both flat, periodically flooded surfaces and sites with some slope. A single site cannot represent the only habitat type of the entire species. [2-WWW] [Martínez-Peralta and Mandujano 2016] [Martínez-Avalos and Suzán-Azpiri 2000]
In a study published in 2026, 305 plants were counted in ten plots in Querétaro. Of these, 241 grew in open sites and 64 beneath nurse vegetation. The site was selected for its high density. The proportion of 79% in open sites refers to this spatial arrangement. [Jiménez-Sierra et al. 2026]
Light and the photosynthetic apparatus
Field measurements showed that adult plants can maintain photosynthetic apparatus efficiency in strong light. Researchers compared chlorophyll fluorescence, the emission of some absorbed energy as light. Parameters varied with season and shade conditions. [Arroyo-Pérez et al. 2017]
Electron transport rate was lower in winter than in the other seasons studied. The result describes acclimated wild plants. Gradual changes in conditions remain necessary when moving plants from a windowsill or sheltered sowing environment into full sun. [Arroyo-Pérez et al. 2017] [Neciu 2006]
Flowers and pollen limitation
In the population studied, most flowers remained open for two days. Adding pollen from other individuals increased mean seeds per fruit from 33.57 to 43.43. The comparison involved 17 and 19 flowers respectively, which produced 14 and 16 fruits. The proportion setting fruit did not differ significantly. [Martínez-Peralta and Mandujano 2016]
Some flowers could set fruit after manual self-pollination, but pollination with other individuals' pollen gave better results. This distinction matters when assessing seed production in collections. Fruiting by one specimen does not prove that the entire population is fully self-compatible. [Martínez-Peralta et al. 2014b]
Seeds remaining on the plant
Some seeds remain between tubercles for a long time. This delayed seed release is called serotiny. In the observed population, retained seeds were found in 86.6% of 30 plants. They could be released when tissue hydration changed or old tubercles died. [Jiménez-Sierra et al. 2022]
Seeds from the oldest sampled zone, estimated to be about 24 years old, also germinated in the laboratory test. Age was inferred from seed position and the estimated rate of tubercle formation. The researchers had not stored this batch under controlled conditions for 24 years. [Jiménez-Sierra et al. 2022]
Seedlings developing between the mother plant's tubercles were found on several plants. This is an observation of retained, mature seeds germinating. High seed longevity in this location does not determine longevity in a paper packet or mean that delaying sowing improves every result. [Jiménez-Sierra et al. 2022]
Cultivation and propagation
Adult plants are grown with their extensive underground part and the need for substrate drying in mind. The approach described in Polish literature uses an airy, predominantly mineral substrate and a dry rest. Limiting root damage is especially important during repotting. [Anonim 2006]
Neciu obtained the first flowers on four-year-old seed-grown plants. He kept young seedlings in a moist, sheltered environment longer than adult plants. The account shows differences between developmental stages but does not set a mandatory flowering age. [Neciu 2006]
Tissue cultures
New shoots were obtained from seedling tubercle fragments through organogenesis, the formation of organs. Somatic embryos arising from cells other than reproductive cells were also observed. Organogenesis produced more plants, while successful rooting remained a separate challenge. [Moebius-Goldammer et al. 2003]
High survival after transfer to soil referred to plants that had already rooted. It is not a success percentage calculated from all sampled fragments. Separating the stages allows a sound assessment of the method's usefulness for propagation and conservation. [Moebius-Goldammer et al. 2003]
Fragment regeneration in a cultivation account
The archived text on the species described regeneration of a retained underground portion and its grafting upside down onto an Echinopsis rootstock. This observation is preserved as a collector's account. The appearance of offsets alone does not establish the structure of the entire fragment used or prove that any root segment will regenerate a plant. [Kaktusy i Inne 2006b, p. 138, 173]
Studies of biological activity
Studies of this species' applications are presented in a separate account in “Biotechnology and applications”. [Rodríguez Garza et al. 2010]
Microhabitat in relation to available shelter
In the spatial observation published in 2026, open ground comprised 52.56% of the 90 m² studied and contained 241 of 305 ariocarpus plants. Among 64 sheltered plants, 46 occurred beneath Karwinskia humboldtiana, compared with about 34 expected from this shrub's canopy cover. Seven cacti were found beneath Parthenium incanum, compared with about 23 expected. Open sites and the canopies of different shrubs thus formed different parts of the same site. [Jiménez-Sierra et al. 2026, pp. 4–5, tables 1 and 3]
Physiological measurements in Tolimán covered six adult plants 3–6 cm in diameter beneath the densest parts of K. humboldtiana canopies and six in the open. Fluorescence was measured once in each season, from autumn 2011 to summer 2012, after twenty minutes of dark adaptation. Short series of increasingly strong light allowed estimation of electron transport in the photosynthetic apparatus. Its maximum was greater under shelter and declined markedly in winter in both microhabitats. [Arroyo-Pérez et al. 2017, p. 2–5, ryc. 1–2]
Bees and autumn flowering
In a year-long observation of 231 plants in Tolimán, flowering occurred from October to December 2015. Neighbouring Neolloydia conoidea flowered earlier, in spring and summer. Both species' flowers were visited by bees of the genera Augochlora and Lasioglossum and honey bees. Agapostemon was observed only on ariocarpus. Three of the four identified bee taxa were shared, with different proportions of visits by each. [Arroyo-Pérez et al. 2021, p. 29–34, ryc. 2, tabela 2]
The experiment in this population included 20 flowers per treatment. Natural fruit set was 85%, cross-pollination produced 100%, manual self-pollination 15% and spontaneous self-pollination under cover 5%. The first two results did not differ significantly. The local pattern therefore showed a strong advantage of other individuals' pollen and a small capacity to reproduce using self-pollen. [Arroyo-Pérez et al. 2021, p. 31, 34–35, tabela 3]
Seed and regeneration trials
The germination trial of seeds from the above-ground bank lasted 20 days on 1% agar at 25°C with a twelve-hour photoperiod and no presowing treatment. Samples ranged from 19 to 100 seeds per stem zone. Details of tubercle dating and the results appear in the account of the above-ground seed bank. [Jiménez-Sierra et al. 2022, p. 363–366, tabele 1–2]
In tissue culture, each BA and NAA treatment comprised six tubercle sections, two in each of three vessels. The highest mean for indirect organogenesis was 6.3 shoots per section at BA 13.3 µM and NAA 5.4 µM. After shoot separation, rooting reached about 25–30%, depending on material preparation. These successive stages are described in the article on in vitro regeneration. [Moebius-Goldammer et al. 2003, p. 390–392, tabela 1]