Petradoria pumila (Rock Goldenrod)
Asteraceae (Sunflower Family)

Foothills. Roadsides, woodlands, openings. Summer.

"Petra" is from the Greek for "rock: and "doria," is, according to William A. Weber, "an old name for a Goldenrod".  "Pumila" is Latin for "dwarf".

A specimen of this plant was first collected for science by Thomas Nuttall "in open situations on shelving rocks" in the Rockies (Intermountain Flora).  Nuttall named the plant Chrysoma pumila in 1841 and Edwin Greene renamed it Petradoria pumila in 1895.  This is the only species in the Petradoria genus.