Conyza Canadensis
Used to be known as Erigeron Canadensis. It has a somewhat hot taste like black pepper. I like the taste but I think it is better to use as a spice. Many use it in place of tarragon. I do not know what tarragon taste like so cannot comment on that. I used to grow it now I try and manage it. It does not take much for it to get away from you and overtake things. Some call it Horseweed, some call it mares tail. Is resistant to glyphosate so be careful where you forage it.
https://www.ediblewildfood.com/horseweed.aspx
http://www.eattheweeds.com/conyza-canadensis-herb-fire-food-2/
It helps fight cancer and reduces oxidative stress.
https://www.ncbi.nlm.nih.gov/pubmed/26846256
https://www.ncbi.nlm.nih.gov/pubmed/21294076
Kills flukes.
https://www.ncbi.nlm.nih.gov/pubmed/26695200
Phytochemicals, wow has some good ones.
https://www.ncbi.nlm.nih.gov/pubmed/23270230
https://www.ncbi.nlm.nih.gov/pubmed/21954558
https://www.jstage.jst.go.jp/article/cpb/50/12/50_12_1558/_article
Has anti-inflammatory effects, possibly by upregulating heme oxygenase-1 expression.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4122705/
https://www.ncbi.nlm.nih.gov/pubmed/19521071
https://www.ncbi.nlm.nih.gov/pubmed/3725873
Prevents blood clotting.
https://www.ncbi.nlm.nih.gov/pubmed/21172723
Fights parasites and fungus.
https://www.ncbi.nlm.nih.gov/pubmed/22612410
https://www.ncbi.nlm.nih.gov/pubmed/23049473
https://www.ncbi.nlm.nih.gov/pubmed/21054146
Antibacterial.
https://www.ncbi.nlm.nih.gov/pubmed/22623891
Seems it may help with adrenal fatigue.
https://www.ncbi.nlm.nih.gov/pubmed/20121251
Reduces oxidative stress, and decreases CO2 generation in platelets.