Canadanthus

The Canada Aster,ÌýGreat Northern Aster, Western Bog Aster, aster modesteÌý

CanadanthusÌýNesom includes a single species of North American aster first described asÌýAster modestusÌýLindl. Nesom (1994) placed the species in its own genusÌýCanadanthusÌý²¹²õÌýCanadanthus modestusÌý(Lindl.) G.L. Nesom. Xiang and Semple (1996) found it to be basal withinÌýSymphyotrichumÌýin the broadest sense based on cpDNA RFLP analysis. This was confirmed in Brouillet et al.(2001). Semple (in Semple et al.1996) treated it asÌýAster modestus. Nesom's combination was accepted by Semple et al.(2002) and is the name used for the species in Flora North America. The species is diploid with x=9 (2n=18).

Canadanthus modestus range tentative

Last revised 11 May 2025 by J.C. Semple

© 2025 J.C. Semple, including all photographs unless otherwise indicated

Canadanthus Nesom Habit
Canadanthus modestus S 7008 WAT inflor
Canadanthus Nesom Heads
Canadanthus modestus Semple 7008 fruit

1-4. Canadanthus modestus. 1. Upper stem, Semple & Brouillet 4294, Alberta. 2. Inflorescence, Semple & Brouillet 7008, Broadwater Co., Montana. 3. Flowering heads, S & B 4294. 4. Mature fruit, S & B 7008.

Brouillet, L.Ìý 2006.ÌýCanadanthusÌýG.L. Nesom. pp. 458--459. In Flora North America Editorial Committee, North America. Vol. 20. Asteraceae, Part 2. Astereae and Senecioneae. Oxford University Press, New York.