The leaves of most plants are flat, facilitating the efficient capture of sunlight for photosynthesis. Leaf curvature is expressed in terms of Gaussian curvature — "the product of curvature in orthogonal direction". Coordinating the growth of central and marginal regions of a leaf to produce a flat surface, or zero Gaussian curvature, is more "difficult" that the generation of a curved leaf. There are many more confirmations that adopt either negative or positive Gaussian curvature. In the February 28
Nath et al. isolated a CIN mutant of Antirrhinum, which had ...
