Meconopsis cambrica, the Welsh poppy, is a perennial flowering plant in the poppy family Papaveraceae. It has yellow to orange flowers and is widely grown as a garden plant. It is a native of damp, rocky sites in upland areas of Western Europe from the British Isles to the Iberian Peninsula. It has been used since 2006 as the basis for the logo of the political party Plaid Cymru.
Meconopsis cambrica has pinnately divided leaves composed of pinnately divided leaflets.<ref name="Stace"/> The plant can grow between Template:Convert tall. It blooms between June and July.<ref name=Readers>Template:Cite book</ref> The flower is distinctively yellow or orange with four petals, and coarsely hairy green sepals that fall off soon after the flower opens. It spreads easily from the numerous small black seeds produced in the summer, from a long, ribbed capsule that opens with flaps.<ref name=Readers/>
Meconopsis cambrica is endemic to upland areas of Western Europe; it is found natively in the mountains of the Iberian Peninsula, the Pyrenees, the Massif Central and some western parts of the British Isles (Wales, south-western England and parts of Ireland).<ref name="Stace"/><ref>Template:Cite journal</ref> It has, however, been widely naturalised outside its native range.<ref name="Stace"/>
Meconopsis cambrica lives in damp, shady places on rocky ground.<ref name="Stace">Template:Cite book</ref> In its most western locations, it is increasingly found on more open ground with less cover. It is especially well adapted to colonising gaps and crevices in rocks and stones. This habit has enabled it to colonise the urban environment, growing between paving slabs and at the edges of walls.
Taxonomy and phylogeny
The species was originally named by Carl Linnaeus in his 1753 Template:Lang as Papaver cambricum.<ref name="Prain">Template:Cite journal</ref> In 1814, Louis Viguier separated it from Papaver, making it the type species of the new genus Meconopsis. One of the reasons was the structure of the style: Papaver has unstalked stigmas, arranged in a disc shape, whereas M. cambrica has stigmatic surfaces at the end of a distinct style. Later, many newly discovered species from the Himalayas and adjacent regions of China were added to the genus. M. cambrica is the only species that is native to Europe.<ref name=KadePresValt11>Template:Citation</ref>
However, a molecular phylogenetic study published in 2011 showed that M. cambrica is not related to other species of Meconopsis, but is instead nested within Papaver, suggesting that Linnaeus' original name should be restored. However, this would leave the genus Meconopsis without a type species and hence without a valid name, unless the name were to be conserved.<ref name=KadePresValt11/> This name change has already been accepted by 'The Plant List'<ref>Template:Cite web</ref> (which is becoming the international arbiter of plant names) and by the RHS 'Plant Finder'<ref>Template:Cite web</ref>..