Botanical Illustration of Plant Thorn Structure - Anatomy and Function #3542265 (License: Personal Use)

This black-and-white line drawing depicts a sharply pointed, modified stem or stipule-commonly termed a thorn-arising from a woody branch. The illustration includes a longitudinal section showing layered vascular tissues and a basal swelling indicating its origin from the cortex or epidermis. Fine stippling and contour lines emphasize texture and depth, typical of 19th- to early 20th-century botanical plates.

Used in academic botany textbooks, online plant morphology resources, or museum exhibits to teach plant defensive structures; matches user intent seeking anatomical clarity on thorns vs. spines vs. prickles.