Synonym:  Aster ontarionis  Wiegand


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Perennials.  Colony forming from long, creeping rhizomes.  Stems are straight, slightly pubescent toward the base, becoming more densely pubescent upwards (or glabrous in var. glabratum).  Typical plant height is 2 to 4 ft. (6 to 12 dm).

The overall inflorescence and branch inflorescences are  panicle-like, with ascending or spreading branches ("peaked").  Flower heads are relatively small, sometimes congested and  nearly one-sided on branches.

Heads are radiate.  Ray florets are typically white, pistillate and fertile.  Disc florets are pale yellow, turning magenta with age, bisexual and fertile.  Lobes of the disc corollas are long, spreading to recurved.  Involucral bracts are appressed; dark green patches distinct, oblanceolate.

Basal and lowermost stem leaves are often deciduous by flowering.  Mid- to upper stem leaves are ovate to lance-ovate, or oblanceolate, on short petioles or lacking petioles. Lower leaf surfaces are pubescent. (var. ontarionis) or glabrous (var. glabratum).

Plants of shaded, moist, alluvial soils, floodplain deciduous forests, roadsides or field edges.  Flowers:  late August to late September.  Native.

Similar species:  Symphyotrichum lateriflorum.





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