The following comments comes from BEN #270 and is attributed to
Dr. John Semple 

All of the species [of the specimens sent for identification] belong
in the genus Symphyotrichum. DNA work shows clearly that Aster is a
strictly Old World genus. 


Aster anonmalus,Engelm.
Aster borealis, (T & G. Provancher
Aster brachyactis,Blake
Aster ciliolatus,Lindl.
Aster conspicuous,Lindl.
Aster cordifolius,L.
Aster ericoides, L.
Aster falcatus,Lindl.
Aster johannensis,Fern.
Aster junciformis,Rydb.
Aster laevis,L.
Aster lateriflorus,(L.) Britt.
Aster laurentianus, Fern
Aster macrophyllus,L.
Aster modestus,Lindl.
Aster novae-angliae,L.
Aster paludosus,Willd.
Aster pansus,(Blake) Cronq.
Aster pauciflorus,Nutt.
Aster praealtus,Poir.
Aster ptarmicoides,(Nees) T.&G.
Aster ptarmicoides,,var. lutescens,(Lindl.) Gray
Aster puniceus,L.
Aster sagittifolius, Wedemeyer
Aster sericeus,Vent.
Aster simplex,Willd.
Aster umbellatus,Mill.,var.pubens,Gray
Aster vimineus,Lam.