The transfer of those species of Erigeron sometimes segregated under Leptilon to the widespread tropical genus Conyza by Dr. Arthur Cronquist (1943) brings together five annual weeds of Texas which are obviously closely allied. They may be distinguished by the following key. Specimens mentioned in the discussion are in the Herbarium of Southern Methodist University.
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Shinners, Lloyd H.
"The Texas Species Of Conyza (Compositae),"
Field and Laboratory: Vol. 17
Available at: https://scholar.smu.edu/fieldandlab/vol17/iss4/2