Lycium barbarum
There is one case report in which ingestion of a Chinese herbal tea made from Lycium barbarum appeared to interfere with the effect of warfarin.44
44. Lam AY, Elmer GW, Mohutsky MA. Possible interaction between warfarin and Lycium barbarum L. Ann Pharmacother 2001;35:1199?201.
Not really informative, but it's all I can find at the moment.