Elsholtzia ciliata (Thunb.) N. Hyl. (syn.: E. cristata Willd., E. patrinii (Lepechin) Garcke) (Asia) – A very rare and ephemeral alien. Recorded in 1997 as an urban weed in Liège (Dieu & al. 1997), without obvious vector of introduction. In 2000 also seen on a demolition site of a former grain mill at the Albertkanaal in Merksem (a single specimen), along with, among others, Lepyrodiclis holosteoides (see Verloove 2003).
Selected literature:
Dieu J.-M., Lambinon J. & Rousselle J. (1997) Quatre adventices sur les trottoirs de la ville de Liège: Catapodium marinum, Diplotaxis muralis, Elsholtzia ciliata et Phytolacca esculenta. Nat. Mosana 50(1): 17-18.
Grayum M.H. & Rohman M.F. (1986) Four rare Eurasian adventives in the flora of western Massachusetts. Rhodora 88(855): 413-417.
Martine C.T. & Quarta E. (2012) Exotic Elsholtzia ciliata (Lamiaceae) Abundant In the Ausable River Delta, Clinton County, New York. Rhodora 114(959): 334-336.
Świeboda M. (1963) Distribution of Elsholtzia patrini (Lep.) Garcke in Poland. Fragm. Florist. Geobot. 9: 239-243.
Verloove F. (2003) Graanadventieven nieuw voor de Belgische flora, hoofdzakelijk in 1999 en 2000. Dumortiera 80: 45-53.