Literature Cited
Reveal, J. L. & C. S. Keener. 1981.Virgulus Raf. (1837), an earlier name forLasallea Greene (1903) (Asteraceae). Taxon 30: 648–651.
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Addendum. Brittonia 33, 522 (1981). https://doi.org/10.1007/BF02805556
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DOI: https://doi.org/10.1007/BF02805556