Glands actively secrete substances into the environment. In plants, these are mostly nectar-glands which are located in the flowers (e. g. in Helleborus – Hellebore). Glands can occur also outside of flowers, e. g. as extrafloral nectaria (e. g. at the transition between petiole and lamina in Prunus avium – Wild Cherry) or as lime-glands (e. g. at the leaves of Saxifraga paniculata – Livelong Saxifrage).