Figure 11. Silphium glutinosum. 

A. Habit, idealized, with lowest pairs of leaves persistent (these often withered by anthesis), X1/6, detail showing lower leaf surface. 

B. Two views of head, X3/4, upper with details showing hairs on peduncle and phyllary. 

C. Pale (chaff), X6, with detail showing abaxial surface. 

D. Achene, X3 1/2. 

Drawing by Vicky Holifield.