One of my projects this summer was monitoring the flowering phenology of Echinacea pallida in the restoration east and southeast of the parking lot at Hegg Lake Wildlife Management Area. When compared with Echinacea angustifolia flowering phenology, this will help us assess the temporal extent of the opportunity for hybridization between these species.
There were 19 flowering heads on 16 plants. The figure below illustrates the flowering periods of the 17 heads for which I could assess start and end dates (two heads finished flowering before I started monitoring). I define flowering period as the period from the first day of male florets to the last day of female florets. I estimated the last day of female florets based on patterns of flowering and style persistence. Error bars indicate the range of possible end dates (last day florets observed to first day no florets observed).