From Wikipedia - something I never knew about Queen Anne's Lace:
A teaspoon of crushed seeds has long been used as a contraceptive - its use for this purpose was first described by Hippocrates over 2,000 years ago. Research conducted on mice has offered a degree of confirmation for this use - it was found that Wild carrot disrupts the implantation process, and is thus an abortifacient. Chinese studies have also indicated that the seeds block progesterone synthesis, which could explain this effect.
"Very similar in appearance to the deadly poison hemlock, it is distinguished by a mix of bi-pinnate and tri-pinnate leaves, fine hairs on its stems and leaves, a root that smells like carrots, and occasionally a single dark red flower in its center." (Wikipedia)
It wouldn't occur to me to actually go out and pick something wild and use it for medicinal purposes, but I realize that others might. Also - as Patry just mentioned, some folks are highly allergic to this plant. Nature is a dangerous place. Be careful out there!