1. Flora of the USSR [in Russian], Moscow ? Leningrad, Vol. 4 (1954), p. 11.
2. L. N. Bereznegovskaya and T. P. Antsupova, Biol. Nauki, No. 4 188 (1966).
3. T. P. Antsupova, Rast. Res., No. 3, 337 (1968).
4. W. Poethke and W. Kerstan, Pharm. Zentralhalle,99, 331 (1960).
5. A. L. Shinkarenko and N. V. Bondarenko, Rast. Res., No. 2, 45 (1966).