Studies in the genus <i>Hypericum</i> L (Hypericaceae) 5(2). Sections 17. <i>Hirtella</i> to 19. <i>Coridium</i>

Part 5(2) of this monographic series of papers on the genus Hypericum contains treatments of the remaining sections: Sections 17. Hirtella , 18. Taeniocarpium and 19. Coridium , which form a related group centred in eastern Turkey and Transcaucasia and extending in area from Morocco, Portugal and Ireland to western Xinjiang and the Altai and southern Angara-Sayan regions of Siberia. One new series, one new species and one new subspecies are described in Section 17. Hirtella (Series Scabra N.Robson, ser. nov . , H. hedgei N.Robson, sp. nov . , H. hyssopifolium subsp. acutum N.Robson, subsp. nov . ), and two new species and one new subspecies in Section 18. Taeniocarpium ( H. pseudorepens N.Robson, sp. nov . , H. vaccinioides N.Robson, sp. nov ., H. armenum subsp. iranicum N.Robson, subsp. nov . ) . Four new combinations or changes of rank are made, three in Section 17 ( H. elongatum var. lythrifolium (Boiss.) N.Robson, comb. nov ., H. elongatum var. racemosum (Kuntze) N.Robson, comb. nov . , H. elongatum var. antasiaticum (Grossh.) N.Robson, stat. nov . ) and one in Section 18: H. linarioides subsp. alpestre (Steven) N.Robson, stat. et comb. nov .