ðɪs sˈʌbdʒɛnəs ɪŋklˈuːdz tˈuː spˈiːsiːz fɹʌmðə wˈɛstɚn juːnˈaɪɾᵻd stˈeɪts ænd kˈænədə ðæt ɚɹˈɪdʒᵻnˌeɪɾᵻd æz hˈaɪbɹɪdz bᵻtwˌiːn spˈiːsiːz ɪnðə sˈʌbdʒənɚɹə sˈɪmfɪˌɑːtɹɪtʃəm ænd vˈɜːɡjʊləs.
This subgenus includes two species from the western United States and Canada that originated as hybrids between species in the subgenera Symphyotrichum and Virgulus.