Buhner's Healing Lyme 2nd Ed. says (p. 379) Stephania tetandra or Stephania cepharantha.
Same book, p. 380, says dosage for Lyme arthritis and/or neuro-Lyme should be:
Powdered herb: 1-4 "00" capsules
Tincture (1:5, 65% water/alcohol solution): 1/2 teaspoon 3x/day
See
buhnerhealinglyme.com/resources/herb-source-list/ for a list of companies through which the herbs can be obtained. Stephania root is listed, but you have to scroll way down the page almost to the end to find it.
Take care,
-Razzle
Lyme & Bart.; too many health issues to list...