Materia Medica Lesson 5-16? This should have 5-12. . Cephalanthus, Buttonbush

It is not in the links for the player - you have to download it: 5-12 

Bitter. Good for gastric, mouth and duodenal secretions.  MM says elegant bitter and good tonic - just harvest a branch in flower. Moderately astringent. Substitute for gentian. Doesn't just stimulate secretions, but stimulates blood supply to organs that secrete.

CEPHALANTHUS (Button Bush) BARK and TWIGS. Tincture [Fresh Plant, 1:2, Dry Plant, 1:5, 50% alcohol] 10-30 drops, to 3X a day. Best for short term use. STATUS : W/A

Here is the link to the Southwest School of Botanical Medicine Course

https://www.swsbm.com/school/