Proboscidea louisianica (Mill.) Thell. (syn.: Martynia louisianica Mill., M. proboscidea Gloxin) (Mexico, S-USA) – A very rare and ephemeral alien. Recorded as a wool alien in 1947 on waste land in the valley of river Vesdre (Visé 1958). Also grown from wool waste in Verviers in 1950. In 1973 furthermore seen as a weed in a sandy cucumber field in Turnhout (vector of introduction obscure).
Selected literature:
Armstrong W.P. (1979) Unicorn plants in California. Fremontia 7(1): 16-22.
Bretting P.K. (1983) The Taxonomic Relationship between Proboscidea louisianica and Proboscidea fragrans (Martyniaceae). The Southwestern Naturalist 28(4): 445-449.
Conca A., Oltra J.E. & Serra L. (2002) Proboscidea louisianica (Mill.) Thell. (Martyniaceae), nueva para la comunidad Valenciana. Flora Montiberica 22: 10-11. [available online at: https://dialnet.unirioja.es/servlet/articulo?codigo=1394808]
Martín Madrigal E. & Fernández González F. (2000) Proboscidea louisianica (Miller) Thell. (Martyniaceae) en España. An. Jard. Bot. Madrid 58(1): 190-191. [available online at: http://www.rjb.csic.es/jardinbotanico/ficheros/documentos/pdf/anales/200...(1)_179_203.pdf]
Phillippi A. & Tyrl R.J. (1979) The reproductive biology of Proboscidea louisianica (Martyniaceae). Rhodora 81(827): 345-361. [available online at: http://www.biodiversitylibrary.org/item/24157#page/1/mode/1up]
Thieret J.W. (1976) Floral biology of Proboscidea louisianica (Martyniaceae). Rhodora 78(814): 169-179. [available online at: http://www.biodiversitylibrary.org/item/14698#page/1/mode/1up]
Visé A. (1958) Florule adventice de la vallée de la Vesdre. Bull. Soc. Roy. Bot. Belg. 90: 287-305.