Features and name status
Tubercles are often elongated, and the stem is olive-green to yellowish-green. Adult tubercles usually lack the small apical areole typical of many A. retusus. Flowers are cream or pale yellow. Each feature requires assessment together with the others. [Anderson and Fitz Maurice 1998]
Ariocarpus trigonus (F.A.C.Weber) K.Schum. is accepted in POWO at species rank. The historical A. retusus subsp. trigonus remains its synonym. The difference in rank between an older book and the current atlas therefore reflects different treatments of the same plant. [2-WWW]
Distribution and habitat
POWO lists Tamaulipas and Nuevo León. Regional Tamaulipas studies described sites associated with foothill scrub, including the Jaumave valley area. Limestone substrates occurred under conditions differing from higher sites of some A. retusus. [2-WWW] [Martínez-Avalos and Suzán-Azpiri 2000]
Habitat differences do not translate directly into one temperature set for every plant in a collection. Vegetation shelter and substrate properties also matter when interpreting a map and site elevation. The regional distribution account provides cultivation context but not a complete greenhouse recipe. [Martínez-Avalos and Suzán-Azpiri 2000] [Anonim 2006]
Flowers and pollen production
In the comparative study, mean flower width was 31.15 ± 1.04 mm for 25 flowers. The mean and its standard error were given. A. trigonus was among species with high pollen production and many ovules in the studied set. [Martínez-Peralta et al. 2014a]
Despite abundant self-pollen, manual self-pollination produced much lower fruit set than cross-pollination. Pollen quantity and compatibility are separate factors. Independent parent plants and matching flowering times therefore matter for seed production. [Martínez-Peralta et al. 2014b]
Growth and flowering in cultivation
Neciu described five-year-old A. trigonus that had not yet flowered despite reaching about 5–7 cm in diameter. Other species of the genus flowered earlier in the same collection. The comparison shows variation in maturation rate under particular conditions, without establishing a fixed age at first flowering. [Neciu 2006]
Watering adult plants is linked to active growth, temperature and pot drying. The Polish account recommended a permeable substrate and dry rest. When a plant moves to a sunnier location, exposure is changed gradually. [Anonim 2006] [1-WWW]
Propagation from seeds
The prolonged moist, sheltered seedling care described by Neciu concerns early growth. After the sowing enclosure was opened, conditions changed gradually. More distinct watering and drying cycles were introduced as plants developed. Adult tubercle appearance does not emerge immediately after germination. [Neciu 2006]
Alkaloids and scope of findings
The 1970 paper identified hordenine, trace N-methyltyramine and N-methyl-3,4-dimethoxy-β-phenethylamine. This was chemical identification of plant material components, described in the supplied abstract. [Speir et al. 1970]
Alkaloid presence alone does not confirm hallucinogenic effects. The cited analysis did not examine effects in humans or assess consumption safety. Psychoactive properties and medicinal use are therefore not assigned to the species here as proven. [Speir et al. 1970]
Predominance of cross-pollination despite abundant pollen
In material from Chihue, A. trigonus produced the most pollen grains per flower among seven species compared. Self-pollen germinated on the stigma and began growing in the style, but was often inhibited farther along the path to the ovary. Abundant pollen production thus coexisted with a barrier limiting self-pollen use. [Martínez-Peralta et al. 2014a, p. 670–671, tabela 1; p. 534–536, ryc. 4] [Martínez-Peralta et al. 2014b, p. 670–671, tabela 1; p. 534–536, ryc. 4]
After manual self-pollination, pollen tubes in the ovary were recorded in 18.5% of 27 pistils, and fruit set in 5.1% of a separate sample of 39 flowers. Tube arrival in the ovary and mature fruit development describe successive stages. Fruit set was assessed five to six months after pollination. [Martínez-Peralta et al. 2014b, p. 532, 534–535, tabela 1]