1. Urochloa panicoides Beauv. [syn.: U. helopus (Trin.) Stapf] (Afr., As.) – A regular but always ephemeral grain alien, primarily introduced with birdseed (see also Grenfell 1989). First seen near a grain mill in the port of Roeselare in 1993 (Verloove & Vandenberghe 1994) and now seen most years but in very few places (ports of Antwerpen, Gent, Roeselare and occasionally elsewhere). Usually found near unloading quays, by motorways or railway tracks, more rarely on dumps.
The lower floret is usually said to be neuter (Wipff & Thompson 2003) but plants with staminate lower florets have also been recorded (a diacritic feature shared with the African but perennial Urochloa mosambicensis (Hack.) Dandy).
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Selected literature:
Grenfell A.L. (1989) Aliens and adventives. Adventive news n°40. BSBI News 51: 31 (+ frontpage).
Verloove F. & Vandenberghe C. (1994) Nieuwe en interessante graan- en veevoederadventieven voor de Belgische en Noordfranse flora, hoofdzakelijk in 1993. Dumortiera 58-59: 44-59.
Wipff J.K. & Thompson R.A. (2003) Urochloa. In: Barkworth M.E. & al. (eds.), Flora of North America north of Mexico, vol. 25. Oxford University Press, New York-Oxford: 492-507.