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I.  Hagemann, ?Wuchsformenuntersuchungen an zentraleuropaischen  Hypericum- Arten. (Analysis of growth forms of central European  Hypericum species.)?, Flora (Germany), vol. 173, pp. 97-142 (1983)- illus., 1983.

P. J.  Calie, Schilling, E. E., and Webb, D. H., ?Flavonoid chemistry of the generic segregates  Ascyrum and Crookea of Hypericum.?, Biochem. Syst. Ecol., vol. 11, pp. 107-109 (1983)-, 1983.

N.  Robson, ?Yellow-flowered St. John's worts.?, Living Countryside, vol. 12, pp. 2801-2803 (1983)- illus., col. illus., 1983.

M.  Bugnicourt, ?Embryogenie des Hypericum de France.?, Bull. Soc. Bot. France Lett. Bot., vol. 130, pp. 195-205 (1983)- illus., 1983.

N. K. B.  Robson, ?British and Irish St. John's worts: 1. Introduction and shrubby species.?, Wild Flower Mag., vol. no. 398, pp. 22-25 (1983)- illus., 1983.

N. K. B.  Robson and Long, D. G., ?Notes relating to the Flora of Bhutan: 7. Notes on  Hypericum L.?, Notes Roy. Bot. Gard. Edinburgh, vol. 41, pp. 133-139 (1983)- illus., map., 1983.