Species: Ageratina occidentalis
Encyclopedia of Puget Sound
Western Boneset is a rhizomatous perennial herb with clustered stems that are often woody at the base and 15-70 cm tall. The alternate leaves are triangular or ovate in outline and 2-7 cm long with toothed margins. The lower leaves are reduced and early deciduous. The lower leaf surfaces have small, unstalked glands. The flowering heads are borne in an open, branched inflorescence. The involucral bracts are 3-5 mm long and mostly equal in length. The heads lack ray flowers, and there are 9-21 purple or pink disk flowers in each head. The top of the achene bears a tuft of numerous fine bristles.
Classification
Dicotyledoneae
Asterales
Asteraceae
Ageratina
NatureServe
Classification
Ecology and Life History
Western Boneset is a rhizomatous perennial herb with clustered stems that are often woody at the base and 15-70 cm tall. The alternate leaves are triangular or ovate in outline and 2-7 cm long with toothed margins. The lower leaves are reduced and early deciduous. The lower leaf surfaces have small, unstalked glands. The flowering heads are borne in an open, branched inflorescence. The involucral bracts are 3-5 mm long and mostly equal in length. The heads lack ray flowers, and there are 9-21 purple or pink disk flowers in each head. The top of the achene bears a tuft of numerous fine bristles.