👉 The term "subarachnoidean" is a scientific term used in the field of botany. It refers to a type of plant that is characterized by its elongated, narrow leaves and leafless stems, which are often covered with spines or thorns. Subarachnoideans are also known as "spiny" plants because their leaves have sharp, pointed tips. They are commonly found in the forests of tropical and subtropical regions around the world.