Sanicula mariversa is a rare species of flowering plant in the family Apiaceae known by the common name Waianae Range black-snakeroot.

The leaves have leathery, dark green, heart-shaped or kidney-shaped blades up to 15 centimeters long by 23 wide which are palmately divided into three to five dissected lobes.

[3] This plant grows on the Makua-Keaau and Kaluaa-Lualualei Summit Ridges of the central Waianae Mountains.

The area has been invaded by non-native species of grasses including soft chess (Bromus mollis) and annual fescue (Vulpia spp.).

Another source of habitat degradation is the mountains' population of feral goats, which scale the slopes, breaking up the soil and causing erosion.