This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
The flower-heads of Matricaria Chamomilla.
Characters. - About three-fourths of an inch (18 millimetres) broad, composed of a flattish, imbricate involucre, a conical, hollow, naked receptacle, about fifteen white, ligulate, reflexed ray-flowers, and numerous yellow, tubular, perfect flowers without pappus.