Biochemical study of plant raw material of Silphium L. spp. in M. M. Gryshko National Botanical Garden of the NAS of Ukraine - D. B. Rakhmetov; O. M. Vergun; N. O. Stadnichuk; O. V. Shymanska; S. O. Rakhmetova; V. V. Fishchenko (Plant introduction, 2019)