Coriaria pottsiana

Coriaria pottsiana, commonly called the Hikurangi tutu or Pott's tutu, is a rare low-growing sub-alpine perennial summer-green shrub, only known to exist on a small grassy scree slope behind the tramping hut on Mount Hikurangi in the Gisborne Region of New Zealand's North Island. The Mt Hikurangi tramping hut is found at .
Description.
The delicate shrub grows to a height of , with a spread. It is rhizomatous, with slender four-sided stems growing from its slender rhizomes. Branches and branchlets are very slender, with small crinkled oblong to broad oval-shaped dark red opposite leaves with wavy margins that sometimes end in a distinct rounded point, are in size, are truncate at their base, are distant, have purplish undersides, and have slender petioles hardly 0.5 mm ( in) in length. Its racemes are long, and are found at the tip of stems, or elsewhere on main branches. Its white flowers, found on slender pedicels up to in length, are distant, with broadly oval sepals about in size (sometimes toothed), similar petals, and 5 ribbed carpels.
Like all "Coriaria" species, the plant is poisonous, especially the seed inside the small black berries. However, the juice of some "Coriaria" berries is not poisonous, and was used by Māori, who called members of the genus "tutu".