the leaves on many brunnera species also sport an interesting shape: that of a heart. Below we explore 12 varieties of brunnera that have this pretty leaf shape, and outline how they can add ...

Knowing it’s difficult to reproduce veins, the group decided to use the system already in place on a spinach leaf by replacing spinach cells with human heart cells, the Washington Post reports.

Females lay their eggs on passionflowers (Passiflora), a genus of tropical vines with extreme variation in leaf shape, both between and within species. For example, related species can have ...

Stoddard and her colleagues analyzed over 47,000 photos of eggs of 1,400 bird species in a 2017 study, which found a link between a bird’s egg shape and ... soil or under leaf litter, while ...