Data were collected in the field from a common garden experiment conducted in 2011, near the town of Molas (Yucatan, México). Data are the mean number of seeds per fruit for each of 14 maternal plant families, shown separately for each of two levels of soil fertilization. These means were used to calculate the potential number of seeds produced per plant (# of fruits recorded*mean # of seeds for the appropriate family-treatment combination). Abbreviated headlines are as follows (from left to right): plant maternal family ("genotype"), mean number of seeds per fruit in fertilized conditions ("#seedsperfruitF"), and mean number of seeds per fruit in unfertilized conditions ("seedsperfruitNF"). Data were collected over a two-month period (November-December) in 2011.