close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - showing a single bloom at full open with detail of disk flowers blooming.
field image of Silphium terebinthinaceum PRAIRIE DOCK at the James Woodworth Prairie Preserve - a single stalk at full bloom showing a typical flower head with about two dozen flowers and buds.
Summary[edit] Description: Polski: Rożnik przerośnięty (Silphium perfoliatum), Ogród Botaniczny PAN w Warszawie. Date: 2 October 2017, 12:23:52. Source: Own work. Author: Salicyna.
close up image of Silphium integrifolium deamii DEAM'S ROSINWEED at the James Woodworth Prairie Preserve - several flowers after blooming as seeds mature; one is beginning to show seed dispersal structures.
Summary[edit] Description: English: Silphium perfoliatum in Wrocław University Botanical Garden. Date: 1 August 2016, 16:01:31. Source: Own work. Author: Krzysztof Ziarnek, Kenraiz.