Literature

Authors	Year	Title
J. M. Gillett, Robson N. K. B.	1981	The St. John's-wort of Canada (Guttiferae).
K. R. Shivanna, Ciampolini, F., Cresti, M.	1989	The structure and cytochemistry of the pistil of Hypericum calycinum: the stigma.
Y. Kimura	1980	The type specimen of Hypericum japonicum Thunberg.
S. N. Biswas	1989	Three new taxa of Hypericum Linn. (Hypericaceae) from India, Nepal and Burma.
S. K Lozykowska, Dabrowska J.	1996	Topaz: Polska odmiana dziurawca zwyczajnego (Hypericum perforatum L.) (Topaz: the Polish variety of St. John Wort (Hypericum perforatum L.).)
J. Dagley	1994	Tutsan (Hypericum androsaemum) in Essex.
E. K. Cameron	2003	Two new native plants found in the Aukland Region.
P. Singh, Dash S. S.	2001	Two new plant records for India from Sikkim.
S. J. Park, Kim K. J.	2005	Two new species of Hypericum (Clusiaceae) from Korea.
Z. Y. Li	1988	Two new varieties from China.
G. Wittenberger	1982	Uber das Vorkommen der Unteraten des Tupfelharteus (Hypericum perforatum L.)
A. Ramos	1984	Un hibrido nuevo de Hypericum.
A. N. Sennikov	1993	Vidy sektsii Hirtella roda Hypericum (Hypericaceae) v stranakh SNG i Gruzii. (Species of the section Hirtella of the genus Hypericum (Hypericaceae) in the countries of the CIS and Georgia.)
A. J. Healy	1972	Weedy St. John's worts (Hypericum spp.) in New Zealand.
I. Hagemann	1981	Wuchsformenuntersuchungen an balkanischen Hypericum-Sippen. (Investigation of the growth form of Hypericum taxa from the Balkan Peninsula.)
I. Hagemann	1983	Wuchsformenuntersuchungen an zentraleuropaischen Hypericum- Arten. (Analysis of growth forms of central European Hypericum species.)
B. Weberling, Weberling F.	1993	Wuchsformuntersuchungen im Paramo Costa Ricas: 4. Untersuchungen an Senecio und Hypericum Arten. (Studies on growth forms in the Paramo of Costa Rica: 4. Species of Senecio and Hypericum.)
N. Robson	1983	Yellow-flowered St. John's worts.
A. G. Elenevskii, Zernov A. S.	2000	Zametka o Hypericum strictum (Hypericaceae) i blizkikh vidakh. (Note on Hypericum strictum (Hypericaceae) and allied species.)
A. N. Sennikov	1998	Zametki po sistematike i nomenklature nekotorykh taksonov iz rodov Adonis L. (Ranunculaceae), Linum L. Linaceae), Adenophora Fisch. (Campanulaceae) i Hypericum L. (Hypericaceae). (Notulae taxonomicae et nomenclatoricae de taxis nonnullis e generibus Adoni
E. Foerster	1971	Zur Unterscheidung von Hypericum maculatum und H. tetrapterum im blutenlosen Zustand.
K. Kaplan, Grenzheuser, W., Lenski, H.	1989	Zur Verbreitung und Bestandssituation des Sumpf-Johanniskrautes (Hypericum elodes) im nordwestlichen Westfalen und in der Grafschaft Bentheim.