Setosus
/seh-TOH-sus/🏷️ Taxonomy●● Intermediate
Also known as: setosa, setosum
A texture epithet describing a surface covered in stiff, straight, bristle-like hairs (setae) — harder and more rigid than pubescens or pilosus, but not as sharp as spines. The bristles may deter grazing animals or trap insects. Appears as setosus (masculine), setosa (feminine), or setosum (neuter).
Etymology
From Latin seta (a bristle, stiff hair) + -osus (full of).
Example
“Opuntia setosa and Urtica setosa both bear the stiff, bristle-like surface features the epithet describes — structures harder and more persistent than ordinary pubescence but not true spines.”