Seven genera of Compositae-Heliantheae-Coreopsidinae as delimited by Hoffman (1894) are found in Texas….Thelesperma has been the subject of partial synopses and extended. notes (Gray, 1884; Rydberg, 1900; Blake, 1928), but has never been revised. The genus reaches its greatest development in Texas and northern Mexico; seven of the thirteen known species are included in the following synopsis. The remaining six are listed at the end for the convenience of those interested.
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Shinners, Lloyd H.
"The Texas Species Of Thelesperma (Compositae),"
Field and Laboratory: Vol. 18
Available at: https://scholar.smu.edu/fieldandlab/vol18/iss1/4