Caulis is a botanical term that refers to the stem of a herbaceous plant. This term has synonyms that can be helpful to understand the different aspects of the plants. Some of the synonyms for Caulis include Stipe, Trunk, Stock, Axis, Shaft, and Peduncle. The word Stipe is often used to refer to the stem of fungi, algae, or lichens. The term Trunk is more often used to describe the main stem of a tree or a large shrub. The words Stock, Axis, and Shaft are highly context dependent and can also describe the stem of specific plants. The term Peduncle is used for the stem that bears the flowers or fruits and can be found in plants like grapes, strawberries, and cherries.