On the cover The swallowtail butterfly (Papilio machaon L.) studying the mysteries of wild teasel inflorescence (Dipsacus fullonum L.). The first one is bijugate phyllotaxis emerging typically from the initial decussate one. The second is  bi-directional blooming, which starts from the equatorial area of the inflorescence. The regulatory mechanism of this peculiar behavior remains unknown.

[Author: Beata Zagórska-Marek]