For Tropaeolum
Sparre, B., and L. Andersson. 1991. Taxonomic revision of the Tropaeolaceae. Nordic Publications in Botany. Google Scholar
Tucker, G.C. 2010c. Tropaeolaceae. In Flora of North America Editorial Committee. 2010. Flora of North America north of Mexico. Volume 7, Magnoliophyta: Brassicaceae to Salicaceae. Oxford Univ. Press, New York, NY. 797 pp. Google Scholar
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