Hoary Stinging Nettle
Urtica dioica holosericea / Nettle Family
Soledad, CA - Pinnacles National Monument
June 28, 2006
This is one plant that every hiker should learn to identify from a distance, it will "bite!" The little toxin-containing glass-like hairs will break off in skin, causing extreme pain. I know from experience! The toxins include histamine, acetylcholine, and 5-hydroxytryptamine.