>>64395Be very careful about plants you gather from the wild. Be sure you positively identify them before harvesting and using. Many have poisonous look-a-likes.
For example: Pic is poison hemlock (also called conium) which looks very similar to yarrow.
This is from the wiki about conium:
Poison
Conium contains the pyridine alkaloids coniine, N-methylconiine, conhydrine, pseudoconhydrine and gamma-coniceine (or g-coniceïne), which is the precursor of the other hemlock alkaloids.[3][5][6]
The most noted of these chemicals is coniine, which has a chemical structure and pharmacological properties similar to nicotine.[3][7] Coniine disrupts the workings of the central nervous system through action on nicotinic acetylcholine receptors. In high enough concentrations Coniine can be dangerous to humans and livestock.[6] Due to high potency, the ingestion of seemingly small doses can easily result in respiratory collapse and death.[8] Coniine causes death by blocking the neuromuscular junction in a manner similar to curare; this results in an ascending muscular paralysis with eventual paralysis of the respiratory muscles which results in death due to lack of oxygen to the heart and brain. Death can be prevented by artificial ventilation until the effects have worn off 48–72 hours later.[3] For an adult the ingestion of more than 100 mg (0.1 grams) of coniine (approximately 6 to 8 fresh leaves, or a smaller dose of the seeds or root) may be fatal.[9]
I recommend this book:
http://www.amazon.com/Botany-Day-Thomas-Elpels-Families/dp/1892784076 