The medicinal parts of St. John's wort are the fresh leaves and flowers
The roots and the bark.
whole plant is used for medicine
The medicinal parts of alfalfa are the whole plant and the seeds.
Chinese medicine uses various parts of the plant, the shoots and leaves.
Extracts from the plant's root are used in alternative medicine as a soap and as an herbal dietary supplement.
The root of the plant is used medicinally, particularly in China, where traditional Chinese medicine places a high value on it.
In alternative medicine, the leaves, twigs, and sometimes the berries of mistletoe are used.
The dried leaves, ripe dried seeds, and fresh leaves of the one-year-old plant, or the leaves of the two-year old plant are the parts that were used in medicine.
The stems of cuscuta are used in Western herbalism and the seeds are used in traditional Chinese medicine (TCM).
All parts of the bugle weed that grow above ground are used in herbal medicine. It is collected in early spring before the flower buds open. The entire plant is dried and pulverized.
The aerial parts of the plant are used medicinally.
Plants are more important for medicine than clothes. There is subsitude for plant fiber available for clothes but there is no subsitude for plant products used in medicine. The synthetic chemicals used as medicine have side effects. the plant products are by and large are quite safe.
Hard to say. Plants were used in medicine from prehistoric time.