Reference

Herwig Teppner (2011): Flowers of Boraginaceae (Symphytum, Onosma, Cerinthe) and Andrena symphyti (Hymenoptera - Andrenidae): Morphology, Pollen, Portioning, Vibratory Pollen Collection, Nectar Robbing – Phyton, Annales Rei Botanicae, Horn50_2: 145 - 180.

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