Abstract
Bidens longistyla, an annual species with a square stem and yellow rays, known only from the States of Nuevo León and Coahuila, Mexico, is described as new.
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Hart, C. R. 1973. Systematics of theBidens ferulaefolia complex: A cytotaxonomic and comparative flavonoid investigation. Ph.D. thesis: University of Iowa, Iowa City.
Sherff, E. E. 1955.Bidens, pp. 70–129.In: E. E. Sherff and E. J. Alexander, North American Flora, Series II, Part 2.
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Hart, C.R. A new species of Bidens (Compositae) from Mexico. Brittonia 30, 289–292 (1978). https://doi.org/10.2307/2806663
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DOI: https://doi.org/10.2307/2806663