5. Echinochloa hispidula (Retz.) Nees ex Royle (syn.: E. crus-galli (L.) Beauv. var. hispidula (Retz.) Honda, E. crus-galli subsp. hispidula (Retz.) Honda) (SE-As.) – An exceptional and ephemeral alien. Scattered specimens were seen on a grain dump in the port of Brugge in 2008, most likely introduced with rice (as cattle fodder).
Echinochloa hispidula is, with E. oryzicola (Vasing.) Vasing. and E. oryzoides (Arduino) Fritsch, one of the typical rice field weeds in southern Europe (and in many warm-temperate and subtropical parts of the world). They are all readily distinguished from Echinochloa crus-galli by their much larger spikelets. In general habit they often closely resemble rice plants. Most of these species are obligate weeds of rice but at least Echinochloa hispidula now also occurs on river banks in Spain, for instance along river Llobregat near Barcelona (pers. obs. September 2007).