In Texas, Erigeron strigosus Muhl. shows great variation, having: (1) spring forms which frequently resemble E. tenuis T.&G. and which have strigose, usually scanty pubescence; (2) taller summer forms with dense, predominantly spreading pubescence; and (3) autumn forms of tall plants having conspicuous basal rosettes.
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Van Vleet, Robert L.
"Phenotypic Variations of Erigeron strigosus Muhl. (Compositae) in Eastern Texas,"
Field and Laboratory: Vol. 19
Available at: https://scholar.smu.edu/fieldandlab/vol19/iss4/2