Regel, ?Trudy Imp. S.-Peterburgsk. Bot. Sada 11: 311. 1890.?, 1890.

Regel, ?Bull. Soc. Imp. Naturalistes Moscou xli. I. 95. 1868?, 1868.

Regel, ?Cat. Pl. Hort. Aksakov. 93.?.

Regel, ?Gartenl. (1855) 245. t. 130.?.

Regel, ?Bot. Zeitung (Berlin) 9: 596. 1851?, 1851.

Regel and Regel, ?Cat. Pl. Hort. Aksakov. 59, nomen.?.

Regel, Regel,, Regel,, Regel,, Regel,, Regel,, Regel,, Regel,, Regel,, Regel,, Regel,, and Regel, ?Cat. Pl. Hort. Aksakov. 21.?.

Regel, ?Cat. Pl. Hort. Aksakov. 21. 1860.?, 1860.

Miers, Miers,, and Regel, ?Gartenfl. (1853) 322. t. 68.?.

Regel and Regel, ?Repert. Bot. Syst. (Walpers) iii. 934 (1844-45), sphalm.?.