White Veratrum (Veratrum Californicum) is also known as False Hellebore. "Veratrum" is Latin for "true black", referring to the black rhizomes (roots).  "Tenu" is Latin for "thin" or "slender" and "petalum" is Greek for "a leaf" or "spread out flat" and refers to the spreading leaves. Photographed on the Mount Defiance Trail, Interstate 90, Washington, USA.