The genus Cassia is represented in Texas by 15 well-marked species. One of these, C. fasciculata, is a highly variable taxon composed of several intergrading infraspecific taxa. The following treatment is the result of several summers' field work combined with distributional data and morphological study of herbarium material. In the present paper it has been necessary to make two new varietal combinations in C. fasciculata. Hence, in conformity with Article 17 of the International Code of Botanical Nomenclature (1952), it seems desirable to give a somewhat detailed account of the distributional and morphological evidence which leads the author to treat the C. fasciculata complex as indicated.
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Turner, B. L.
"The Cassia fasciculata Complex (Leguminosae) in Texas,"
Field and Laboratory: Vol. 23
Available at: https://scholar.smu.edu/fieldandlab/vol23/iss3/7