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Botanical terms need to know:-    
there are many terms of botany(study of plants) that you should need to know.
let started from stem-

Stem

1. Node: the part of a plant stem from which one or more leaves emerge, often forming a slight swelling or knob.

Why is it necessary to give this part of the stem a special name? Beyond the biological reason that there must be something special happening there in order for a leaf to “know” it must grow from this point, there is the convenience for us when we try to describe how leaves are arranged along a stem, which you will see when we look at leaf arrangement.

2. Internode: the part of a plant stem between two of the nodes from which leaves emerge.

I rarely use or see this term when trying to identify a plant, but it follows so logically from the definition of node that I thought it worthwhile to mention.

3. Bud: an undeveloped or embryonic shoot and normally occurs in the axil of a leaf or at the tip of the stem. (definition from wikipedia)

You’re probably already familiar with buds. In the illustration below, the bud is occurring in the “axil” of the leaf, which is the upper angle between the leaf stalk and the stem. Recognizing buds is important under two circumstances when trying to identify plants. 1) When you need to distinguish a bud from a “stipule” (the next term), and 2) When you need to determine whether a leaf is “simple” or “compound” (coming up!).

4. Stipule: a small leaflike appendage to a leaf, typically borne in pairs at the base of the leaf stalk.

The stipules shown here are more or less snug up against the stem and the leaf stalk (you may wish to click on the images to enlarge them and see the stipules more clearly). Stipules come in wildly varying forms, and not every plant even has stipules. They are good aids to identification, though, so look closely for them whenever you examine a new plant.