The genus Cotoneaster has been thoroughly studied and documented in Belgium for more than 10 years now. In addition to one rather rare and local native species (Cotoneaster integerrimus Medik.) at least 24 additional, reliably identified non-native species are known to occur / to have occurred (see the updated Excel-version of the “Catalogue of neophytes in Belgium” on http://alienplantsbelgium.be/ for an overview). A few more require further study and confirmation.
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Verloove (2008) reported about the discovery in 2001 of a well-established population of Inula racemosa Hook. f., a native of the western Himalayas, by a railway track near Kortrijk (Marke). In the very same area (Rollegem) a second, smaller population was furthermore discovered on an old dump in 2006. This species had long been confused with the exceedingly similar Inula helenium L.
Yucca L. (Spanish-bayonet), originally confined to the southernmost United States and parts of Central America, is a popular genus in cultivation, especially in the hotter and drier parts of the world. In Belgium a few species are grown as ornamentals, indoor as well as outdoors. In recent years Yucca is increasingly recorded as an escape from cultivation (often merely as a garden throw-out) in Belgium but little is known about the exact identity of these escapes and about their persistence.
Dianthus carthusianorum is a rather rare and local native species of thermophilous grasslands and calcareous rocky slopes (Lambinon & al. 2004). It is only native in parts of Wallonia (especially river valleys) and absent from Flanders (Van Landuyt & al. 2006). Since the 1990’s Dianthus carthusianorum has been claimed from artificial habitats outside its native distribution area in Belgium. It was then mainly confined to coal mine heaps and obviously introduced on purpose (in so-called wild flower seed mixtures).
Convolvulus silvaticus (syn.: Calystegia silvatica), widely overlooked in Belgium?