Parchment Grass is a stackable item used for Alchemy and Cooking. It is obtained by using the botany skill on the plant with the same name. Doing so will grant you 1-3 Parchment Grass. Parchment Grass has the folloing in-game discription:
Location[]
The green dots represent the location of Parchment Grass in Polar Borderlands:
The green dots represent the location of Parchment Grass in the Sea of Oblivion: