Figure 1:

Schematic diagram showing the pattern of seed development for orthodox seeds of foxglove (Digitalis purpurea L.) based on original data from Hay (1997). Mass maturity is defined as the point when maximal dry weight is reached (Ellis and Pieta Filho, 1992). The dashed and continuous parts of the arrows indicate the time when the trait (the ability to germinate before or after drying, and longevity) is increasing and stable, respectively.