Contents

03 January 2020
Vol 367, Issue 6473

About The Cover

Cover image expansion

COVER Immature trap of the carnivorous plant Utricularia gibba (~200 μm in width), illustrating its two-layered cellular structure. Such cup-shaped leaves have evolved multiple times as a mechanism for trapping animals. Analyzing U. gibba, researchers used a combination of molecular genetics and computer modeling to reveal how shifts in gene expression domains can account for repeated evolution of cup shapes from species with planar leaves. See pages 24 and 91.
Image: Karen Lee and Claire Bushell