Ichtyoselmis
Previously this was known as Dicentra macrantha, now Ichtyoselmis (or sometimes Ichthyoselmis). Ichthys in Greek, means 'fish', hence the common name of goldfish plant, due to the colour and shape of the flowers. One species from China and Burma. Needing a cool and damp situation to thrive.
The flower structure, unique to this and other genera in the 'Dicentra group', restricts the range of pollinators that can access the rich nectar source inside to larger, more powerful pollinators like bumblebees. Flowering in spring, this is a valuable plant for queen bumblebees just emerging from hibernation.