Blackthorn: Used to make a bitter tea that is used to treat altitude sickness (City of Sorcery, Chapter 19). Perhaps the same as black thornleaf, used in poultices to treat frostbite by "draw[ing] the blood to the limbs and back to the heart"; also given in tea for frostbite (The Forbidden Tower, Chapter 6).
Blackthorn: Used to make a bitter tea that is used to treat altitude sickness (City of Sorcery, Chapter 19). Perhaps the same as black thornleaf, used in poultices to treat frostbite by "draw[ing] the blood to the limbs and back to. the hea,rt"; also given in tea for frostbite (The Forbidden Tower, Chapter 6).