Editing Hypericum perforatum (section)

=== Subdivision ===
[[File:Hypericum perforatum subsp. veronense Gavoi 950m 20072014.jpg|thumb|''H. perforatum'' ssp. ''veronense'']]
''Hypericum perforatum'' exhibits a great deal of variability in its appearance across its distribution. Thus, determining the exact nature of its [[Infraspecific name|infraspecific taxa]] is difficult because of the many intermediate forms that exist.<ref name="Robson-2002" />{{rp|88}}
* ''H. perforatum'' [[subspecies]] ''perforatum'' <small>Stjep.-Vesel.</small> is the type form of the species. It is distributed from the origin of the species in Siberia, west to central Europe, and east to northern Mongolia. The base changes as the plant grows from round to a broad wedge shape, and the seed capsule [[Vitta (botany)|vittae]] are present throughout the plant's life cycle and are almost always narrow.
** ''H. perforatum'' [[Variety (botany)|variety]] ''angustifolium'' <small>DC.</small> is a variety of the species that is found in drier climates within the range of ssp. ''perforatum''. It has leaves that look more like those of ssp. ''veronense'', but they have [[Petiole (botany)|leaf stalks]]; the glands on the seed capsule are also distinct.<ref name="Robson-2002" />{{rp|88}}
** ''H. perforatum'' var. ''humile'' <small>Stranski</small> can be found in parts of the southern Balkans. These plants possess smaller, more ring-shaped leaves and the seed capsules have flattish [[Vesicle (biology and chemistry)|vesicles]] on their surface. These appear to be adaptations of ssp. ''perforatum'' in response to the mountainous habitats of the region.<ref name="Robson-2002" />{{rp|89}}
* ''H. perforatum'' ssp. ''songaricum'' is likely the most primitive after ssp. ''perforatum''. Previously described as a variety by [[Karl Koch (botanist)|Karl Koch]], [[Norman Robson (botanist)|Norman Robson]] elevated the taxon to subspecies in his monograph of the genus. The leaves are sessile and have a heart-shaped base that partially surrounds the stem.<ref name="Robson-2002" />{{rp|89}}
** ''H. perforatum'' var. ''gracile'' has smaller leaves and is found in western Kazakhstan, southern Russia, and southern Ukraine. In the drier areas of this range the variety exhibits a dull grey-green color on the underside of its leaves.<ref name="Robson-2002" />{{rp|89}}
* ''H. perforatum'' ssp. ''veronense'' can be found in the Caucasus, across the Middle East to Tajikistan, and along North Africa to [[Macaronesia]]. These plants have narrower leaves and display diagonal vittae on the seed capsules. Where it meets the distribution of ssp. ''perforatum'' the two subspecies hybridize regularly.<ref name="Robson-2002" />{{rp|89}}
** ''H. perforatum'' var. ''ellipticum'' retains the diagonal vittae of the subspecies but the leaves are not as narrow. The variety is distributed in areas with greater moisture such as in the mountainous areas of Turkmenistan.<ref name="Robson-2002" />{{rp|89}}
* ''H. perforatum'' ssp. ''chinense'' is found across most of China and was introduced into Japan (under the synonym ''H. foliosissimum'' <small>Koidz.</small>). Both its leaves and flowers are smaller, and the flower clusters are smaller and more crowded on the ends of longer branches.<ref name="Robson-2002" />{{rp|89}}