In LeRoy E. Detling's Revision of the North American species of Descurainia (Amer. Midi. Nat. 22: 481-520, 1939), the barely distinguishable races of D. pinnata are termed subspecies. The following are credited to Texas, listed here with the proper name as variety. Since a proposal to make mandatory the repetition of the specific epithet for the typical variety of a species has been approved by members of the American Society of Plant Taxonomists, and by a preliminary symposium at Utrecht considering proposals to be submitted to the next International Botanical Congress (see Brittonia 7: 16-17, 1949), no name is proposed here for Detling's D. pinnata ssp. typica.
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Shinners, Lloyd H.
"Nomenclature Of Texas Varieties Of Descurainia Pinnata (Cruciferae),"
Field and Laboratory: Vol. 17
Available at: https://scholar.smu.edu/fieldandlab/vol17/iss4/4