Hypericum ×moserianum André (= H. calycinum L. × H. patulum Thunb. ex Murray) (Cult.) – An exceptional and probably ephemeral escape from or – more likely – relic of cultivation. Discovered in 2015 on a demolition site by the Albertcanal in Laakdal, along with numerous other garden plants. A plant discovered in Couthuin in 2013 probably also belongs to this hybrid.
Hypericum ×moserianum is similar to H. ×hidcotense and also frequently cultivated as an ornamental. However, it is a smaller shrub like H. calycinum (but without creeping rhizomes), its anthers are brick-red and stamens are at least half as long as the petals. It also is partly fertile (Robson 1985).
Robson N.K.B. (1985) Studies in the genus Hypericum L. (Guttiferae), part 3. Bull. Brit. Mus. Nat. Hist. 12: 163-325.