ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Leaf veins. Macrophotograph of a leaf from a lime tree (Tilia sp.) showing the leaf veins dividing diagonally into successively finer vessels. Leaf veins contain vascular bundles that transport food (carbohydrates) and water in and out of the leaf. The branching arrangement seen here distinguishes dicotyledonous flowering plants from the monocotyledons, which have narrow leaves and parallel veins.
Model release not required. Property release not required.