Energy medicine operates within a holistic world view. It is not really useful to attempt to make strong distinctions in terms of which modalities affect the physical body and which affect the mental, emotional and spiritual aspects of the person. One can say that herbal medicine and homeopathy are used most frequently for physical concerns, and that flower essences are used most frequently for mental, emotional and spiritual concerns.
Here are some distinctions among modalities that are usually found "bottled."
Herbal Medicine: the use of whole herbs (often in tincture, captule or tablet form) for healing. The use of herbs for healing goes back into pre-history, in all cultures. Examples are traditional North American, British and European herbalism, as well as Ayurveda in India and Chinese herbs. Herbal medicine is biochemical, and therefore there is the possibility of interaction with other biochemical agents, including pharmaceutical drugs.
Aromatherapy: the use of essential oils derived from plants for healing by inhalation. These oils have fragrance; they are partially biochemical and partially energetic medicines.
Homeopathy: the use of natural substances (plant, animal, and mineral) that have been prepared through an extended process of dilution and succussion (hitting). Homeopathic remedies are regulated under the FDA in the US, and they are used widely in Britain (including in the National Health Service), Europe and India. The British royal family has relied on homeopathy for generations, and there is a Royal Homeopathic Hospital in London. Homeopathic remedies are usually found in the form of small white pellets, They are selected and used in accordance with homeopathic principles, which are quite different from the principles of mainstream (allopathic) medicine; for example, frequency of dosage makes more difference than quantity in homeopathic medicine. It is now understood that the energetic pattern of the remedy is carried in the water, and its potency is enhanced through the dilution and succussion process. For more information directed to the non-homeopath, see the website of the National Center for Homeopathy: http://www.nationalcenterforhomeopathy.org/
Flower Essences: the use of the energy patterns of specific flowers, carried in water, for mental, emotional and spiritual healing. Because they are not biochemical, homeopathic remedies and flower essences do not interact with biochemical drugs, although biochemical drugs can interfere with the actions of energy medicines. Flower essences are usually dispensed into the mouth from dropper bottles, although they can also be applied to the skin. A good source for more information is the Flower Essence Services website: http://www.fesflowers.com/faq_essences.htm .