Anatomical and Ultrastructure Differences Between Some Species of the Genus Elsholtzia Willd. of Flora of Ukraine, Zotsenko, Liudmyla, Nuzhyna Nataliia, Kyslychenko Viktoria, and Futorna Oksana , Pharmacognosy Journal, July 2021, Volume 13, Issue 4, p.977-987, (2021)