Two native species of Linaria (L. texana Scheele and L. canadensis (L.) Dumort. occur in Texas. The former is common on sandy to sandy clay loams nearly throughout the state; the latter is confined to sandy sites in the central and eastern counties. Both are abundant in recently abandoned fields in east Texas. Mass-collections were made during March and April of 1955, totalling 335 plants (207 L. texana, 128 L. canadensis) in 8 counties of northeastern Texas. Numbers of individuals taken ranged from 3 to 47 at each of 21 locations. Seven contained both species, 4 only L. canadensis, 10 only L. texana.
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"Populations of Linaria (Scrophulariaceae) in Northeastern Texas,"
Field and Laboratory: Vol. 23
Available at: https://scholar.smu.edu/fieldandlab/vol23/iss3/3