Today I roamed around campus, snapping a few pictures I will need later this semester. My primary targets were terminal buds of oaks, birches, and beeches. I managed to find a few additional plants that were photogenic. One of these was a rose:
You might notice sharp outgrowths on the stem of the plant. To the average person these are called thorns, however, to a botanist they are prickles (thorns are woody outgrowths of branch/stem tissue that occur at nodes, while prickles are outgrowths of the epidermis that occur between nodes). So Poison was wrong, not every rose has its thorns. In fact, no rose has thorns.
A prickle by any name is still just as sharp.