View photos of the medicinal plant Ceanothus integerrimus (Deerbrush), profiled in Medicinal Plants of the Western Mountain States (as Ceanothus spp.).

A passage from Medicinal Plants of the Western Mountain States:

Considering no other group in the Buckthorn family has Red root’s unique effect on the lymphatic system, the plant is sort of an anomaly. At the core of Red root’s therapeutic influence is its effect on lymphatic tissue, immunologic cells, and blood–lymph lipids.