H. F.  Lu, Cheng, C. G., Tang, X., and Hu, Z. H., ?FTIR spectrum of Hypericum and Triadenum with reference to their identification.?, Acta Bot. Sin., vol. 46, pp. 401-406, 2004.

H. F.  Lu and Hu, Z. H., ?Comparative anatomy of secretory structures of leaves in Hypericum L.?, Acta Phytotax. Sin., vol. 39, pp. 393-404 (2001) - illus., 2001.