The species of Chrysopsis of the United States and Mexico fall into strikingly heterogeneous groups. One, with slender, parallel-veined leaves and sericeous pubescence (C. graminifolia and allies), was treated by Nuttall (the original author of Chrysopsis itself) under Pityopsis. Another, with shorter or broader net-veined leaves and long, soft pubescence (C. gossypina and allies) has traditionally been regarded as typical Chrysopsis. Species of both groups are characterized by having conspicuous rays, and double pappus in all florets.
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Shinners, Lloyd H.
"The North Texas Species of Heterotheca, Including Chrysopsis (Compositae),"
Field and Laboratory: Vol. 19
Available at: https://scholar.smu.edu/fieldandlab/vol19/iss2/3