Ironweed, Veronia species of flowers.

Veronia Noveboracensis known as New York Ironweed is the one I am familiar with. Most of the Veronia species contain Vernolid A which has been shown to inhibit cincer. V Noveboracensis does not contain as much as the others. This is the only species I have seen in person.

https://www.ncbi.nlm.nih.gov/pubmed/21256125

https://www.ncbi.nlm.nih.gov/pubmed/22176676

https://www.ncbi.nlm.nih.gov/pubmed/21649480

Veronia Amygdalina and V. Cinerea were the most potent of the Veronia species.

https://www.ncbi.nlm.nih.gov/pubmed/23395623

V Amygdalina reduces oxidative stress and helps with diabetes.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4295350/

V Cinerea can help with nicotine addiction.

https://www.ncbi.nlm.nih.gov/pubmed/25857233

V Amygdalina can reduce oxidative stress.

https://www.ncbi.nlm.nih.gov/pubmed/26196573

V amydalina is hepaprotective.

https://www.ncbi.nlm.nih.gov/pubmed/25553678

Have not seen toxicity studies on the other Veronia species but V. Cinerea shows no toxicity.

https://www.ncbi.nlm.nih.gov/pubmed/20645763

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