Apera intermedia Hack. (SW-As.) – A very rare and ephemeral alien. Recorded in 1907 on rough ground in Brussels (Vorst), without further details. In 2013 seen as an urban weed in Antwerp.
This species is much reminiscent of Apera interrupta and may have been overlooked. In the British Isles it has been recorded as a wool alien (Ryves & al. 1996).
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Selected literature:
Bor N.L. (1968) Gramineae. In: Townsend & al. (eds.), Flora of Iraq, vol. 9. Ministry of Agriculture, Baghdad: VI + 588 p.
Bor N.L. (1970) Gramineae. In: Rechinger K.H. (ed.), Flora of Iran, vol. 70/30. Akademische Druck- und Verlagsanstalt Graz, Austria: 573 p.
Davis P.H. (ed.) (1985) Flora of Turkey and the East Aegean Islands, vol. 9. Edinburgh Univ. Press.
Tsvelev N.N. (1984) Grasses of the Soviet Union, part 1 and 2. A.A. Balkema, Rotterdam: XVI + 1196 p.
Ryves T.B., Clement E.J. & Foster M.C. (1996) Alien grasses of the British Isles. BSBI, London: XX + 181 p.