[3] Later, the plant produces a seed capsule, oblong to clavate (shaped like a club) with ribs and up to 2 cm long.

It was formerly described by the Swedish botanist Carl Linnaeus in his seminal publication Species Plantarum in 1753 on page 506.

Within Western Asia it is found in the Caucasus, Armenia, Cyprus, Egypt (in the Sinai), Iran, Iraq, Israel, Jordan, Lebanon, Syria and Turkey.

In eastern Europe, it is found within Belarus, Estonia, Latvia, Lithuania, Moldova and Ukraine.

In middle Europe, it is in Austria, Belgium, Germany, Hungary, Netherlands, Poland, Slovakia and Switzerland.

In southeastern Europe, within Albania, Bosnia and Herzegovina, Croatia, Greece, Italy, Montenegro, North Macedonia, Romania, Serbia and Slovenia.