Symphyotrichum novi-belgii var. novibelgii
Plants usually slender, sometimes robust, but then not very compact. Stems glabrous or hirsute in lines. Leaf-blades ovatelanceolate or lanceolate to oblanceolate, 7–9 times as long as wide, bases ± clasping. 2n = 48.
Phenology: Flowering Aug–Sep.
Habitat: Sand dunes, sandy or stony upper seashores, saltmarshes, sandy, gravelly or rocky stream shores, edges of moist thickets, edges of sea cliffs, ultramafic barrens, seaside meadows, open seaside mountain heath and meadows
Elevation: 0–800 m
St. Pierre and Miquelon, N.B., Nfld. and Labr., N.S., P.E.I., Que., Conn., Maine, Mass., N.H., N.Y., Pa., R.I., Vt., W.Va., in Mexico, Europe, Australia
Several cultivars of var. novi-belgii are sold in the horticultural trade. The following forms are not recognized here, as they represent mere color variants: forma novi-belgii, forma albiflorus (Victorin) J. Rousseau, and forma roseus E. L. Rand & Redfield.
Symphyotrichum ×subgeminatum (Fernald) G. L. Nesom (as species) (syn.: Aster subgeminatus Fernald) is the hybrid of var. novi-belgii with S. ciliolatum; it has been observed in western Newfoundland and the Gaspé (Quebec). Variety novi-belgii also hybridizes with S. anticostense (L. Brouillet and J. Labrecque 1987).
"thick" is not a number.