Simpson rosinweed in Big Thicket park on Sundew Trail. Texas, October 11, 2008
Simpson s rosinweed (Silphium simpsonii) in Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, July 1, 2012
Flower bud of Simpson s rosinweed (Silphium simpsonii) in Moore s Hill Outcrop at FM Road 3090 near Navasota. Texas, July 1, 2012
Close-up of Simpson rosinweed in Big Thicket park on Sundew Trail. Texas, October 11, 2008