![]() ![]() On a leaf apex, if there is an apical process (generally an extension of the midvein), and if it is especially sharp, stiff, and spine-like, it may be referred to as spinose or as a pungent apical process (again, some authors call them a kind of spine ). Leaf margins may also have teeth, and if those teeth are sharp, they are called spinose teeth on a spinose leaf margin (some authors consider them a kind of spine ). In common language the terms are used more or less interchangeably, but in botanical terms, thorns are derived shoots (so that they may or may not be branched, they may or may not have leaves, and they may or may not arise from a bud), spines are derived from leaves (either the entire leaf or some part of the leaf that has vascular bundles inside, like the petiole or a stipule), and prickles are derived from epidermis tissue (so that they can be found anywhere on the plant and do not have vascular bundles inside ). 3 Definitions and technical distinctions.
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