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.
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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?