Leaves of angelica breweri
are ternately divided, with each stalk further pinnately divided into quite well-separated leaflets, which have serrate edges. Leaves are hairless, while the stems and flower stalks (pedicels) have a very fine hair covering. The plant has a relatively small distribution in the northern Sierra Nevada and the southern Cascade Range.
The stout stem terminates in a compound umbel of up to 50 rays (1 to 4 inches long), each topped by a cluster of small white flowers. The flowers are formed of five small white petals around a center of five protruding white stamens and a greenish-white pistil. When fully mature, individual flowers are generally non-overlapping. Petals are finely hairy. There are no bracts beneath the pedicels.