seeds were found among the different incubation temperatures assayed. However,
incubation temperatures significantly affected final germination percentages of scarified
seeds in most species (Table 1). Thus, in the five Helianthemum species, the lowest
germination percentages of abraded seeds were obtained at the highest constant
temperature (25 1C). All Helianthemum species germinated relatively fast at constant
15 1C, 20 1C and alternating (15/25 1C) temperatures (Table 1), reaching 50% germination
within a 15-day period. In both intact and scarified seeds of all five Helianthemum species,
the highest T50 values were recorded at 25 1C (Table 1).