Placement of leaves, branches, etc, that is, by turns, on one side of a stem and then the other, and no two are at the same level.
The science of plant life.
Food-storage organ in a seedling.
Upper part of a tree, including the branches and foliage.
The plant life of a region.
The development of a seed in such a way as to grow new plants.
A collection of dried plants.
An alga and a fungus that are growing in association.
Arranged in facing pairs.
The stalk of a leaf.
Young plant from the start of germination, when it relies on the seed for nourishment, until it is able to grow on its own, nourishing itself through its own system.
Appendage at the base of the leaf.
Small openings on the surface of leaves that let air and water-vapour in and out (in other words, to breathe and transpire).
External coating of a seed.