Place of publication:
Descriptiones plantarum novarum et minus cognitarum 213. 1879 (G. Maw, Gard. Chron. ser. 2, 13:531. 1880 Apr "korolkowi"; E. Regel, Trudy Imp. S.-Peterburgsk. Bot. Sada 6:499. 1880)
Comment:
a preprint of the journal article by Regel is dated "1879" (fide K. Gandhi, pers. comm. on 3 Apr 2014)