The only recent descriptive account of the United States species of Hymenocallis is that by Small in his Manual of the Southeastern Flora (1933: several corrections of nomenclature are given by Morton, 1935). None of the 11 species there given is credited to Texas.
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Shinners, Lloyd H.
"The North Texas Species of Hymenocallis (Amaryllidaceae),"
Field and Laboratory: Vol. 19
Available at: https://scholar.smu.edu/fieldandlab/vol19/iss2/17