The Plantaginaceae of Texas have been partly or wholly revised by five authors successively: Decaisne in 1852, Gray in 1878, Morris in 1900, 1901, and 1903, Poe in 1928, and Pilger in 1937. None of these revisions is very satisfactory, partly because of reliance on quite unreliable characteristics such as color of plant after drying or number of seeds, partly because of lack of knowledge of distribution patterns of Texas plants, and partly because of limited collections or because different collections were distributed under the same number. In the following synopsis, though written only for the counties of north central Texas from Waco to the Red River and from Mineola west to Palo Pinto, all but two of the species said to occur in the state are accounted for.
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Shinners, Lloyd H.
"The North Texas Species Of Plantago (Plantaginaceae),"
Field and Laboratory: Vol. 18
Available at: https://scholar.smu.edu/fieldandlab/vol18/iss3/3