Symphyotrichum novi-belgii var. crenifolium
Phytologia 82: 138. 1997.
Plants robust, compact. Stems glabrous (sometimes hirsute in lines distally). Leaf-blades widely ovate to oblong, 4–5 times as long as wide, bases strongly clasping. 2n = 48.
Phenology: Flowering Aug–Sep.
Habitat: Stony or sandy, open upper seashores
Elevation: 0 m
Variety crenifolium is known from the Gaspé Peninsula and nearby New Brunswick. Reports from New England states need confirmation, as all of the material from there seen by us is var. novi-belgii or var. elodes.
"thick" is not a number.