[3][4] It has been introduced to numerous locations including Algeria, Sweden, Eastern Europe, the Caucasus, Iraq, Kazakhstan, the Indian Subcontinent, Korea, Far Eastern Russia, New Zealand, Argentina, Ecuador, Hispaniola, the United States, and Canada.

[6] The ebracteate inflorescence is a lax racemose corymb, bearing 10 to 30 flowers, and elongating to 10 cm (4 in) when in fruit.

This is controlled by the timing of the expression of the IaTCP1 gene (a member of the TCP protein domain family), which induces extra cell proliferation in the two larger petals, which are 5–8 mm (0.2–0.3 in) 10 mm (0.4 in) long, obovate-oblong, and cuneate beneath.

The styles are as long as or slightly exceed the apical notch, with valves that have reticulate veins.

The reddish-brown seeds are about 3 mm (0.1 in) long, broadly ovate, and weakly winged beneath.