nival

adjective2

1. •
   Abounding with snow; snowy; snow-covered (now especially in reference to plant habitats).

   • The observed climate warming during the twentieth century has affected alpine vegetation by increasing vascular plant species richness on nival mountain tops […] — 2003
2. •
   Found or thriving in snowy conditions.

   • In 1884 O. Heer published a comprehensive account of the nival flora of Switzerland, in which he listed 338 species of flowering plants found above 2600 m.; of these, 6 were found above 3900 m. — 1914