Impatiens namchabarwensis. Named after the canyon in which it was found, an area of Tibet that began to be explored as recently as the mid-1990s, the rare plant can grow 60cm tall and flowers all year round. The colour of the flower seems to change with temperature and exposure. They sometimes appear truly blue when in a cool climate and change to purple when temperatures rise; a characteristic unique for this species among impatiens

Photograph: Elayne Takemoto/WWF Nepal