Bush - 303 - United States
Davidse - 40583 - United States
Davidse - 41868 - United States
Demaree - 12590 - United States
Echinacea pallida
Eggert - s.n. - United States
Smith - 2949 - United States
Smith - 3040 - United States
Stevens - 1436 - United States
Thomas - 102 - United States
Thomas - 165850 - United States
Yatskievych - 90-203 - United States