Apple stems attach the fruit to the tree. The stem is connected to the apple in the cavity region and is considered part of the apple.
The stem shape, its average length, thickness and attachment characteristics can help in identifying a particular apple variety. The stem can be distinctive yet almost certain to be variable. Specific characteristics are more relative, a trait rather than identical in form.
Apple stems may be long, short or medium in length; this is based on their projection from the cavity bottom to the upper stem tip.
They are slender, medium or thick based on their substance.
Fleshy, knobby or clubbed based on their arrangement.
They are curved or straight, direct or inclined relative to their direction and relationship to the axis of the fruit.
Stems are most useful in comparing apples unless the extension is unusual. Color may also be an identification aid.