Zúñiga C. A., Peña-Valdivia C. B., Trejo C., Padilla D., Vaquera H., Portillo L., Effect of Seed Position on Parental Plant of Kroenleinia grusonii (Hildm.) Lodé. and Echinocactus platyacanthus Link & Otto on Seed Germination at High Temperatures, Plant Species Biology, 2026, 41(4):e70059, doi: 10.1111/1442-1984.70059
A study of seeds from the apical and peripheral parts of two cactus species at six constant temperatures from 20 to 45°C. The available abstract compares dimensions, mass, vigour, dormancy and germination. For Kroenleinia grusonii, it describes better parameters in seeds from the apex. Suggestions about later dispersal and survival are interpretations.