The stinging nettle is a variety of the common nettle and gets its name from the fine, stiff hairs on the underside of its heart - shaped leaves. (naturallysavvy.com)
The branches appear to be covered with stiff hairs as a result of two to three spines growing from the outer edge of autozooids. (eol.org)
Whiskers are known as vibrissae hairs — long, stiff hairs growing around the mouth of many mammals — which are to our furkids what a compass is to mankind. (petsmagazine.com.sg)