Perennial herbs, sometimes parasitic, with perfect, irregular, and usually showy flowers, the stigma having a broad, glutinous surface (except in Cypripedium); the (usually single) anther is sessile on the style; it is 2-celled, each cell containing one or more waxy masses of pollen, pollinia (Fig. 115).
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.