Quantitative Analysis of Hispidulin Content in Clerodendrum petasites Roots Distributed in Thailand, Tangsongcharoen, Thanyathorn, Issaravanich Somchai, Palanuvej Chanida, and Ruangrungsi Nijsiri , Pharmacognosy Journal, September 2019, Volume 11, Issue 5, p.1093-1099, (2019)