Seed size and capitulum position drive germination and dormancy responses to projected warming for the threatened dune endemic (Asteraceae).

Among coastal plant species at risk from rapid environmental changes is the North American Great Lakes dune endemic . Despite being listed as federally threatened, little is known about how seed attributes influence germination and dormancy-break patterns in the context of climate change. Following a previous work where we found differences in the number and weight of seeds among capitulum positions and study sites, here we examine the effects of seed attributes (capitulum position, seed weight, and site of origin) on the proportion and timing of seed germination under temperature treatments that simulate projected warming in the Great Lakes (20/10, 25/10, and 30/10°C day/night).