Will climate change affect flower population?
Its really hard to say for any given field of flowers and its hard to separate temperature from so many other factors that are accompanying climate change. 

For example, rainfall is changing as well as CO₂ levels.  The pH of the rain may change because CO₂ becomes a mild acid when its absorbed into water.  The speed at which the seasonal temperatures vary and how cold is the minimum temperature and how hot is the hottest day will cause parasites and infections which kill plants to appear.  

To be sure the heat is important, but the timing maybe just as important.  The temperature is causing earlier blooms and later growing seasons.  

Each different species is responding differently, but odds are that nearly any given field of flowers is going to feel it.  The temperature is important, but its sometimes hard to guess if its the specific culprit in changes.