Peucedanum species, particularly Peucedanum japonicum and Peucedanum praeruptorum, have a long history of use in traditional medicine systems in East Asia. In traditional Chinese medicine (TCM), these plants are often used as part of herbal formulas to "dispel wind," "reduce swelling," and "promote urination," which can be interpreted as supporting the reduction of edema. However, the attribution of anti-edematous effects primarily comes from these traditional indications rather than modern pharmacological research.

Scientific studies on Peucedanum species have primarily focused on their anti-inflammatory, antitussive, and vasodilatory properties, with some evidence of diuretic effects in animal models. However, these studies are limited in scope, often not directly targeting edema as a clinical endpoint, and mostly conducted in vitro or in rodents. There is a lack of robust clinical trials or pharmacological studies that specifically validate the efficacy of Peucedanum for treating edema in humans.

Overall, the use of Peucedanum for edema is justified by traditional practice, but scientific evidence supporting its use for this condition is minimal and not definitive.