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Hormone-like herbicides, used for large crops, can contaminate non-target areas with their waste. The objective of this study was to evaluate the tolerance of  Mabea fistulifera  and  Zeyheria tuberculosa  to 2,4-D + picloram herbicides by means of morphological and anatomical evaluations. The experiment was performed in a greenhouse in a 4 × 2 factorial scheme. The first factor was the control (without herbicide) and three doses (0.166; 0.333, and 0.666 L ha −1 ) of the herbicide Tordon ®  (402 g L −1  2,4-D + 103.6 g L −1  picloram) and the second factor, the species  Mabea fistulifera  and  Zeyheria tuberculosa . The number of  M. fistulifera  leaves was lower after treatment with the highest dose of the 2,4-D + picloram mixture. The herbicide rates did not influence the number of  Z. tuberculosa  leaves. The higher dose of 2,4-D + picloram caused a more than 50% reduction in leaf area. Toxicity increased linearly as a function of the doses of the 2,4-D + picloram mixture. Changes in the leaf anatomy of the two species treated with herbicides were observed; however, the roots did not show any changes.  Mabea fistulifera  and  Zeyheria tuberculosa  can be recommended for phytoremediation programs in areas contaminated by the herbicides 2,4-D + picloram.

Mabea fistulifera and Zeyheria tuberculosa can be indicated for phytoremediation programs of soils contaminated with hormonal herbicides