Malvastrum coromandelianum (L.) Garcke (Am.) – A very rare and ephemeral grain alien. Recorded for the first time in 1996 in a dump in Rumbeke-Roeselare. Subsequently seen in 2000 on a birdseed dump in Willebroek. Also grown from soybean waste and, probably from the same source, also seen on levelled soil in Bilzen in 2017. Recently found in a bulb field in the Netherlands (Holverda & al. 2009, Reijerse & Verrijdt 2010).
This species much resembles Sida spinosa in general appearance. However, Malvastrum coromandelianum is readily distinguished by the presence of an epicalyx that is lacking in Sida spinosa.
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Selected literature:
Holverda W., van Moorsel R. & Duistermaat L. (2009) Nieuwe vondsten van zeldzame planten in 2005, 2006 en ten dele 2007. Gorteria 34: 1-40.
Reijerse F. & Verrijdt T. (2010) Sida spinosa L., S. rhombifolia L., S. cordifolia L. en Malvastrum coromandelianum (L.) Garcke adventief op lelievelden. Gorteria 34: 121-136.
Verloove F. (1998) Malvastrum americanum en Malvastrum coromandelianum (Malvaceae): nieuw voor de Belgische adventief-flora. Dumortiera 69: 13-15.