?Bull. Acad. Imp. Sci. Saint-Petersbourg 29: 177, 1883?. Submitted.

?Bull. Acad. Imp. Sci. Saint-Petersbourg 10: 457, 1865?. Submitted.

?Bull. Acad. Imp. Sci. Saint-Petersbourg 20: 461, 1875?. Submitted.

?Acta Phytotax. Sin. 12: 230, 1974?. Submitted.