Eggli U., Giorgetta M., Flowering phenology and observations on the pollination biology of South American cacti. 3. Temporally robust sequential “Big Bang” flowering of two unrelated sympatric globular cacti in Northern Argentina, Haseltonia, 2017, 23:97-109, doi: 10.2985/026.023.0113
The complete supplied PDF was read, with visual checks of Figure 4 and Tables 1–2. This observational study covered two sites near Angastaco and 108 field days in four seasons. Insect visits are distinguished from measured pollination effectiveness. Photoperiod and ecological benefits remain hypotheses.