The processed leaves of L. robustum were
obtained from Guiyang, Guizhou Province, People’s Republic
of China. The voucher specimen of the herb sample (No.
A2001-206) and of the source plant (S.Y. Hu & P.P. H. But
23396) were deposited, respectively, in the Museum of the
Institute of Chinese Medicine and the Herbarium of the
Department of Biology, Chinese University of Hong Kong