?Rhodora 6: 178, 1904?. Submitted.

?Trudy Glavn. Bot. Sada 5: 195, 1907?. Submitted.

?Prodr. (DC.) 7: 773, 1839?. Submitted.

?Fl. Zapadnoi Sibiri 9: 2097, 1937?. Submitted.

?Bot. Mag. (Tokyo) 101: 492, 1988?. Submitted.