Dont know if this has been answered but if you have the natural medicine feat and the battle medicine feat, can you use nature to do battle medicine?
Natural medicine: trained in nature. You can apply natural cues to heal your allies. You can use nature instead of medicine to treat wounds. If your in the wilderness, you might have easier access to fresh ingredients, allowing you to gain a +2 circumstance bonus to your check to treat wounds using nature, subject to gm discretion.
Battle medicine: trained in medicine. You can patch up yourself or an adjacent ally, even in combat. Attempt a medicine check with the same dc as for treat wounds and provide the corresponding amount of healing. As with treat wounds, you can attempt checks against higher DCs if you have the minimum proficiency rank. Ther target is then immune to your battle medicine for 1 day