This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
Calendula. - Synonym. - Marigold. The florets of Calendula officinalis Linne (nat. ord. Compositae).
Levant and Southern Europe; cultivated.
Florets about 12 mm. long, linear and strap-shaped, delicately veined in a longitudinal direction, yellow or orange-colored, three-toothed above, the short hairy tube enclosing the remnants of a filiform style terminating in two elongated branches; odor slight and somewhat heavy; taste somewhat bitter and faintly saline.
The chief constituents are - (1) A peculiar principle, Calendulin, which is regarded as analogous to Bassorin. (2) An amorphous bitter principle. (3) Gum.
Dose, 15 to 60 gr.; 1. to 4. gm.
Marigold was formerly supposed to be antispasmodic, sudorific and emmenagogue, but now it is believed to have no therapeutic value.