?Nomencl. Bot. (Steudel) 746, 1821?. Submitted.

?Tent. Fl. Germ. 1: 170, 1788?. Submitted.

?Enum. Stirp. Transsilv. 1: 331, 1816?. Submitted.

?Haandb. Norges Fl. 561, 1906?. Submitted.

?Syn. Fl. N. Amer. (ed.  2)  396, 1886?. Submitted.

?Acta Phytotax. Geobot. 25: 35, 1972?. Submitted.

?Trudy S.-Peterburgsk. Obshch. Estestvoisp. 2: 149, 1871?. Submitted.

?Fl. Eur. Ross. 728, 1911?. Submitted.

?Woody Pl. Distr. Chosen 85, 1940?. Submitted.

?Woody Pl. Distr. Chosen 85, 1940?. Submitted.

?Med. Fl. 2: 49, 1830?. Submitted.

?Gen. N. Amer. Pl. [Nuttall] 1: 251, 1818?. Submitted.

?Bull. Torrey Bot. Club 19: 15, 1892?. Submitted.

?Syn. Pl. (Persoon) 1: 419, 1805?. Submitted.

?Norges Fl. 2: 837, 1874?. Submitted.

?Fl. Lit. Inch. 1: 5, 1782?. Submitted.

?Ill. Fl. Mitt.-Eur. 5, 3: 1687, 1926?. Submitted.

?Fl. Amer. Sept. (Pursh) 1: 263, 1814?. Submitted.

?Beitr. Pflanzenk. Russ. Reiches 4: 56, 1845?. Submitted.

?Prodr. (DC.) 7: 577, 1839?. Submitted.

?Bot. Mag. (Tokyo) 31: 246, 1917?. Submitted.

?Ill. Fl. Mitt.-Eur. 5, 3: 1687, 1926?. Submitted.

?Sp. Pl.  351, 1753?. Submitted.