Broken Bone

Deciduous and Tall Grass Prairie

Comfrey

• Symphytum officinale
• often cultivated
• active chemical ingredient allantoin(Source)
• Allantoin: a  powder, C 4 H 6 N 4 O 3, produced by oxidation of uric acid and the major excretory product of purine degradation in many vertebrates: used medicinally to heal skin ulcers and in lotions,lipsticks, etc., for its soothing effect.(Source)
  (Source)
• External application of the leaf is approved for bruising, pulled muscles and ligaments, and sprains(Peterson Field Guide)
• Leaves and roots poulticed to "knit bones," promote healing bruises, wounds, ulcers, sore breasts

Deciduous:
Sweet or Black Birch Tree

• Betula lenta
• Found in rich woods
• Active chemical ingredient is methyl salicylate(Source)
• methyl salicylate: methyl salicylate a natural or synthetic oil with a characteristic wintergreen odor and taste; used as a counterirritant in ointments or liniments for muscle pain and  also as a flavoring agent. Called also wintergreen oil(Source)

(Source)

• Used for fragrance, in bark tea for fevers, stomachaches, lung ailments, twig tea for fever. to alleviate pain or sore muscles, the oil is applied.

Prairie:

Sweetfern

• Comptonia peregrina
• found in dry soil, common weedy shrub
• active chemical ingredient is Betulin(Source)
• Betulin: (biochemistry) A naturally abundant triterpene, commonly isolatedfrom the bark of birch trees, that can be converted to betulinic acid.(Source)

(Source)

• Cherokee used tea of leaves for roundworms; delaware used a wash to treat blisters; also to purify blood
• use leaf tea as tonic beverage or wash for poison ivy rash
• use for sprains, swelling,a nd tuberculosis(Peterson Field Guide)