Heterotheca marginata Semple is a rare species found in Upper Sonoran desert in the Superstition Mts. and Pinal Mts. of southern Arizona.

Heterotheca marginata Fig 32 Semple 1996

Figure 32.  Morphology and distribution of Heterotheca marginata.  A. Habit.  B-C.  Lower stem leaf and upper stem leaf, respectively, adaxial surface.  D. Head with only some florets drawn.  E. Mid series phyllary with chlorophyllous zone dark; upper margins usually anthocyanotic.  F.  Mature achene with disc corolla attached.  G. Distribution in southern Arizona based on all collections seen.