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G. M.  Kitanov, ?Hypericin and pseudohypericin in some Hypericum species.?, Biochem. Syst. Ecol., vol. 29, pp. 171-178 (2001) -, 2001.

P.  Martonfi, Repcak, M., Ciccarelli, D., and Garbari, F., ?Hypericum perforatum L.: chemotype without rutin from Italy.?, Biochem. Syst. Ecol., vol. 29, pp. 659-661 (2001) -, 2001.

A. E.  Kozhevnikov and Kozhevnikova, Z. V., ?Hypericum laxum (Hypericaceae), a new species for the flora of Russia (Primorsky Territory).?, Bot. Zhurn., vol. 86, pp. 160-163 (2001) - illus., 2001.

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.

P.  Singh and Dash, S. S., ?Two new plant records for India from Sikkim.?, J. Bombay Nat. Hist. Soc., vol. 98, pp. 144-147 (2001) - illus., 2001.

P.  Martonfi, ?New species of the genus Hypericum sect. Hypericum (Guttiferae) from Slovakia.?, Folia Geobot., vol. 36, pp. 371-384 (2001) - illus., col. illus., 2001.

L.  Maffi, Benvenuti, S., R Fornasiero, B., Bianchi, A., and Melegari, M., ?Inter-population variability of secondary metabolites in Hypericum spp. (Hypericaceae) of the northern Apennines, Italy.?, Nordic J. Bot., vol. 21, pp. 585-593 (2001) - col. illus., 2001.

N. K. B.  Robson, ?Studies in the genus Hypericum L. (Guttiferae) 4(1). Section 7. Roscyna to 9. Hypericum sensu lato (part 1).?, Bull. Nat. Hist. Mus. (London), Bot., vol. 31, pp. 37-88 (2001) - illus., 2001.