i received formal herbal and nutritional training at the Southwest Institute of Healing Arts in Tempe, AZ. if you aspire to be an herbalist, i cannot stress enough how important it is to have a knowledgeable teacher to guide you. but i would be nowhere without my reference materials. so, here is a list of books that i have found invaluable on my journey to continue learning about the plants and to heal my body, mind and spirit:
(in no particular order)
The Gift of Healing Herbs by Robin Rose Bennett
Healing Wise by Susun Weed (and any of her other books)
300 Herbs: A Materia Medica & Repertory by Matthew Alfs
Medicinal Herbs by Rosemary Gladstar (and any of her other books)
The Book of Herbal Wisdom by Matthew Wood (and any of his other books)
Evolutionary Herbalism by Sajah Popham (also his online school and podcast)
Weeds Heal: A Working Herbal by Isla Burgess
The Wild Wisdom of Weeds by Katrina Blair
Medicinal Plants of the Desert and Canyon West by Michael Moore (and any of his other books)
The Wild Medicine Solution by Guido Mase
Secret Teachings of Plants by Stephen H Buhner (and any of his other books)
chamomile - Matricaria recutita

california poppy - Eschscholzia californica

calendula - Calendula officinalis