Branch with alternate buds: small branch.
Terminal bud: plant formation that develops into a leaf, and is situated at the side of the end of the branch.
Lateral bud with three sets of bud scales: plant formation that develops into a leaf and is covered with three rows of small protective scales.
Lateral bud with two sets of bud scales: plant formation that develops into a leaf and is covered with two rows of small protective scales.
Spongy pith (core): centre part of a branch.
Auxiliary bud: part of a leaf that secretes a substance.
Blade: main part of the leaf.
Central vein: line dividing the leaf in two.
Lateral vein: line dividing, but not completely, the leaf into sections.
Tip: end of the leaf.

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A cactus is any member of the succulent plant family Cactaceae, native to the Americas. They are often used as ornamental plants, but some are also crop plants.

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