This is the full text of Prof. Dr. E. Röder's article in "Pharmazie" 50 (1995), pages 83-98.
On this site with Prof. Röder's permission. Don't copy this to your site; feel free to link to it instead. The URL is http://www.henriettes-herb.com/PAs/PAs.html
This article has German roots, and it shows. It's written by a pharmacist, not an herbalist, and that, too, shows. Be that as it may, it is still the sanest scientific paper on PA-containing plants that I've seen.
Medicinal plants in Europe containing pyrrolizidine alkaloids was written by Prof. Dr. E. Röder and published in the journal "Pharmazie" 50 (1995), pages 83-98.