Bidens esmartinezii from the Balsas River Basin, Michoacan and Guerrero, Mexico, differs from B. reptans var. urbanii and B. squarrosa, the only other climbing species occurring in the area, by its entire, mostly linear leaf lobes and its larger, brown achenes.
Villaseñor, Jose Luis
"A New Scandent Species of Bidens (Asteraceae) from the Balisas River Basin, Mexico,"
Aliso: A Journal of Systematic and Evolutionary Botany:
3, Article 12.
Available at: http://scholarship.claremont.edu/aliso/vol12/iss3/12
© 1990 Jose Luis Villasenor
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