Euphorbia prostrata Ait. (syn.: Chamaesyce prostrata (Ait.) Small) (Am.) – A very rare and often ephemeral alien. Discovered in 2002 as an urban weed in Oudergem (Brussel; Saintenoy-Simon 2003, sub Euphorbia cf. maculata). Subsequently seen as a garden weed in Poederlee (ephemeral). Discovered in 2006 in relative abundance on an infrequently used railway yard in the port of Liège and since 2007 present in similar habitats in the surroundings of Virton (Saint-Mard) and Tintigny (Saint-Vincent). There perhaps recently naturalized. In 2009 also discovered in cracks of pavement and gravel of a private house in Barchon and in similar circumstances in 2011 in Tielt and in 2015 in Brugge. A large, probably naturalized population was discovered in the city of Hasselt in 2016.
Also regularly recorded in plant nurseries, chiefly as an introduction with olive trees and palms from southern Europe (Hoste & al. 2009). Records of Euphorbia prostrata in urban habitats and gardens are possibly associated herewith.
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Selected literature:
Bátori Z., Erdős L. & Somlyay L. (2012) Euphorbia prostrata (Euphorbiaceae), a new alien in the Carpathian Basin. Acta Botanica Hungarica 54(3-4): 235-243.
Bedouet F. (2007) Un nouveau taxon pour le territoire d’agrément du Conservatoire Botanique National de Bailleul: l’euphorbe prostrée (Euphorbia prostrata). Bull. Soc. Bot. N. Fr. 60(1-4): 32.
Hoste I., Verloove F., Nagels C., Andriessen L. & Lambinon J. (2009) De adventievenflora van in België ingevoerde mediterrane containerplanten. Dumortiera 97: 1-16. [available online at: http://www.br.fgov.be/DUMORTIERA/DUM_97/Dum%2097_1-16_Mediterrane%20containerplanten_Hoste%20et%20al.pdf]
Hügin G. (1997) Die Gattung Chamaesyce in Deutschland. Ber. Bayer. Bot. Ges. 68: 103-121.
Hügin G. (1998a) Die Gattung Chamaesyce in Europa. Feddes Repert. 109(3-4): 189-223.
Hügin G. (1999) Verbreitung und Ökologie der Gattung Chamaesyce in Mitteleuropa, Oberitalien und Südfrankreich. Feddes Repert. 110(3-4): 225-264.
Király G., Elias P. & Dítě D. (2014) Two thermophilic alien species new to the flora of Slovakia. Thaiszia 24(2): 125-134. [available online at: https://www.researchgate.net/publication/267895132_Two_thermophilic_alien_species_new_to_the_flora_of_Slovakia]
Ludwig W. (2005) Über Allium zebdanense, Alnus cordata, Chamaesyce prostrata und Ranunculus psilostachys: zu Funden in und bei Marburg a. d. Lahn. Hessische Floristische Briefe 54: 23-28.
Mouline C. (1993) Euphorbia prostrata Aiton dans le département des Bouches-du-Rhône. Monde Pl. 448: 12-13.
Saintenoy-Simon J. (2003) Groupe flore Bruxelloise. Rapport des excursions de l’année 2002. Adoxa 40-41: 29-52.
Veljic M.M., Rajcevic N.F. & Bukvicki D.R. (2017) Euphorbia prostrata Aiton (Euphorbiaceae) – an adventive species new in Serbia. Botanica Serbica 41(1): 95-98. [available online at: http://botanicaserbica.bio.bg.ac.rs/arhiva/pdf/2017_41_1_687_full.pdf]