Camacho-Velázquez A., Arias S., García-Campusano F., Sánchez-Martínez E., Vázquez-Santana S., Seed development and germination of Strombocactus species (Cactaceae): A comparative morphological and anatomical study, Flora, 2018, 242:89-101, doi: 10.1016/j.flora.2018.03.006
A comparison of seed and seedling development in S. corregidorae and both subspecies of S. disciformis. Microscopy shows the funicular origin of the aril present in S. disciformis and its parenchyma with air spaces. The paper describes seed production, buoyancy and germination experiments without scarification at 25°C, covering opening and hypocotyl development. The esperanzae material comes from a collection and hand pollination.