For example in riparian forests and meadows at the Mur in Southeast Austria the Illyrian Crocus   Crocus exiguus is very frequent, but in flower very early, in february and march. It belongs to the big and heterogeneous group of the alpine Spring Crocuses Crocus vernus s.l. In some floral works (e.g. World Plants) it taken as part of the then quite large group of Crocus heuffelianus HERB. However, according to other sources, it shall have originated hybridogenically from Crocus heuffelianus and Crocus albiflorus.