Hypericum kouytchense

{{short description|Species of flowering plant in the St John's wort family Hypericaceae}}

{{Speciesbox

| image = Hypericum kouytchense (4854539107).jpg

| genus = Hypericum

| parent = Hypericum sect. Ascyreia

| species = kouytchense

| authority = H.Lév.{{cite web | url= http://www.theplantlist.org/tpl1.1/record/kew-2858340

| title= Hypericum kouytchense | publisher= The Plant List |access-date=9 March 2018}}{{cite web

| url= http://www.ipni.org/ipni/idPlantNameSearch.do?id=433539-1&back_page=%2Fipni%2FeditSimplePlantNameSearch.do%3Ffind_wholeName%3Dhypericum%2Bkouytchense%26output_format%3Dnormal | title= Hypericum kouytchense

| publisher = International Plant Names Index | access-date = 9 March 2018 }}

}}

Hypericum kouytchense, the large-flowered St John's wort, is a species of flowering plant in the family Hypericaceae, native to Western China. Growing up to {{convert|3|ft|m|abbr=on}} tall and {{convert|5 |ft|m|abbr=on}} wide, it is a semi-evergreen rounded shrub with blue-green leaves and large yellow flowers with prominent stamens, appearing in midsummer.{{cite web | url = http://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=279225&isprofile=0&

| title = Hypericum kouytchense | publisher = Missouri Botanical Garden| access-date = 9 March 2018}} Flowers are followed by red seed capsules in autumn. Where conditions are favourable it can retain its leaves all year.

The Latin specific epithet kouytchense is a westernisation of Guizhou, a southwestern province of China identified as a hotspot for biodiversity.

This plant, which is hardy down to {{convert|-15 |C|F|abbr=on}}, is cultivated in temperate regions. In the UK it has gained the Royal Horticultural Society's Award of Garden Merit.{{cite web | url= https://www.rhs.org.uk/Plants/9013/i-Hypericum-kouytchense-i/Details

| title = RHS Plantfinder - Hypericum kouytchense | access-date=9 March 2018}}{{cite web

| url= https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals.pdf | title = AGM Plants - Ornamental | date = July 2017

| page = 52 | publisher = Royal Horticultural Society | access-date = 9 March 2018}}

It has been reported as invasive in Hawaii.{{cite web

| url = https://landscapeplants.oregonstate.edu/plants/hypericum-kouytchense

| title = Landscape Plants: Hypericum kouytchense | publisher = Oregon State University, College of Agricultural Sciences, Department of Horticulture | access-date = 9 March 2018}}