S. robynsianum is a perennial, herbaceous plant with long rhizomes and erect stems ranging from 10 to 80 centimetres (4 to 31 inches) tall. The stiff narrow leaves are slightly toothed or entire. Flowers may be produced from August to September. The flower heads are located singly or in groups of up to three on leafy branches. The ray florets are dark blue-violet and the disc florets are yellow.[3]
Symphyotrichum robynsianum was formerly included in the large genus Aster as Aster robynsianum. However, this broad circumscription of Aster is polyphyletic and the North American asters are now mostly classified in Symphyotrichum and several other genera.[6] No subspecies or varieties have been recognized within Symphyotrichum robynsianum.
As of August 2023[update], NatureServe listed S. robynsianum as Secure (G5) globally, last reviewed on 13 July 2016. On a US state and Canadian province basis, it listed the species as Vulnerable (S3) in Quebec; Critically Imperiled (S1) in Manitoba and Wisconsin; and, Secure (S5) in Ontario. Michigan and Minnesota have not been ranked.[1]
Jardin Botanique (18 June 2014). "Biography of Jacques Rousseau". Collections and Archives of the Library – Montreal Botanical Garden. Jardin Botanique de Montreal. Retrieved 3 February 2020.
USDA, NRCS (2014). "Symphyotrichum robynsianum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 8 August 2023.