Eupatorium sessilifolium L.
Habitat: Rocky forests and woodlands, edges of rock balds. [Hardwood to mixed forest (forest, upland)]
Range: Southern Maine and Massachusetts to Indiana, south to Georgia, Alabama, and Missouri
Aids to Identification: Glabrous stem, though can be puberulent in the inflorescence. Leaves pinnately veined, lanceolate to oblong, with a prolonged very slender acumination and rounded sessile base.
Ecological characteristics: Unknown.
Phenology: Late July through September.
Synonyms: Eupatorium sessilifolium L. var. brittonianum Porter.
Known Distribution in Maine: This rare plant has been documented from a total of 1 town(s) in the following county(ies): York.
Reason(s) for rarity: At northern edge of range.
Conservation considerations: None noted.