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Contribution no. 16 from the Botanical Laboratories, University of South Florida, Tampa. This investigation was aided by a grant from the National Science Foundation (G9767). David Kramer and William Alford assisted in these studies as N. S. F. Undergraduate Research Participants (GS-531, GE-112). I wish to express my thanks to the curators or directors of the following herbaria who have kindly allowed me to examine their collections: PH, BUT, F, DAO, GH, IND, MSC, MIL, MO, NY, NDA, OS, RM, SMU, DS, US, COLO, MICH, NEB, TEX, WIS, WVA.
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Long, R.W. Biosystematics of the helianthus nuttallii complex (Compositae). Brittonia 18, 64–79 (1966). https://doi.org/10.2307/2805111
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DOI: https://doi.org/10.2307/2805111