Photo: Eupatorium rotundifolium

Eupatorium pubescens Muhl. ex Willd.

Hairy Boneset

Habitat: Dry to wet siliceous, argillaceous or peaty acid soils, open woods, clearings, savannas, etc. [Hardwood to mixed forest (forest, upland)]

Range: Florida to Louisiana, north to southern Maine, and west to Ohio .

Photo: Eupatorium rotundifolium stem and leaves

Aids to Identification: As a member of the boneset, or thoroughwort, group, E. pubescens has a characteristic broad cluster of white flowers arranged together in multiple heads. The stem is hairy and the opposite sessile leaves are twice as long as they are wide, and pointed at the apex. It is distinguished from the common boneset (E. perfoliatum) by having the opposite leaves seperate at the base rather than fused at the base.

Ecological characteristics: Very little is known about the ecological characteristics of this species in Maine.

Phenology: Flowers July - September.

Family: Asteraceae

Synonyms: Eupatorium rotundifolium L. var. ovatum (Bigelow) Torr.

Photo: Eupatorium rotundifolium

Known Distribution in Maine: This rare plant has been documented from a total of 1 town(s) in the following county(ies): York. It was re-located within the state in 2007.

Reason(s) for rarity: At northern limit of range.

Conservation considerations: Unknown.