Polycarpon tetraphyllum

{{Short description|Species of flowering plant}}

{{Speciesbox

|image = Polycarpon tetraphyllum.jpg

|genus = Polycarpon

|species = tetraphyllum

|authority = L.

|subdivision_ranks = Subspecies

|subdivision = 5; see text

|subdivision_ref =

|synonyms_ref={{cite POWO |id=156239-1 |title=Polycarpon tetraphyllum (L.) L. |access-date=14 March 2022 }}

|synonyms={{collapsible list|

• Alsine polycarpa {{small|Crantz}}
• Alsine succulenta {{small|Delile}}
• Arenaria succulenta {{small|Ser.}}
• Arversia loeflingiae {{small|(Wall. ex Wight & Arn.) Walp.}}
• Hapalosia loeflingiae {{small|Wall. ex Wight & Arn.}}
• Herniaria alsinifolia {{small|(L.) Mill.}}
• Holosteum tetraphyllum {{small|(L.) Thunb.}}
• Illecebrum alsinifolium {{small|Comm. ex Poir.}}
• Illecebrum alsinifolium {{small|L.}}
• Illecebrum frutescens {{small|Comm. ex Schult.}}
• Illecebrum striatum {{small|Pers.}}
• Lahaya memphitica {{small|Schult.}}
• Loeflingia caspica {{small|S.G.Gmel.}}
• Loeflingia indica {{small|Retz.}}
• Mollugo tetraphylla {{small|L.}}
• Paronychia alsinifolia {{small|(L.) Juss.}}
• Paronychia striata {{small|DC.}}
• Polycarpaea alsinifolia {{small|(L.) C.Mohr}}
• Polycarpaea benthamii {{small|Wall.}}
• Polycarpaea depressa {{small|DC.}}
• Polycarpaea lanuginosa {{small|Wall.}}
• Polycarpaea tetraphylla {{small|(L.) E.H.L.Krause}}
• Polycarpon benthamii {{small|Hook.f. & Edgew.}}
• Polycarpon brachypetalum {{small|Gagnep.}}
• Polycarpon depressum {{small|Edgew. & Hook.f.}}
• Polycarpon diphyllum {{small|Cav.}}
• Polycarpon dunense {{small|P.Fraga & Rosselló}}
• Polycarpon floribundum {{small|Willk.}}
• Polycarpon indicum {{small|(Retz.) Merr.}}
• Polycarpon lanuginosum {{small|Edgew. & Hook.f.}}
• Polycarpon loeflingiae {{small|(Wall. ex Wight & Arn.) Benth. & Hook.f.}}
• Polycarpon loeflingiae var. genuinum {{small|Briq.}}
• Polycarpon polyphyllum {{small|Blanco}}
• Polycarpon sauvagei {{small|Mathez}}
• Polycarpon succulentum {{small|Webb & Berthel.}}
• Polycarpon tetraphyllum f. depauperatum {{small|(Merino) Amich}}
• Polycarpon tetraphyllum f. ovalifolium {{small|(Merino) Amich}}
• Polycarpon tetraphyllum var. diphyllum {{small|(Cav.) Romo}}
• Polycarpon tetraphyllum var. fontqueri {{small|O.Bolòs & Vigo}}
• Spergula succulenta {{small|D.Dietr.}}
• Spergularia succulenta {{small|(Delile) G.Don}}

}}}}

Polycarpon tetraphyllum, commonly known as four-leaved allseed (also fourleaf allseed or fourleaf manyseed), is a plant of the family Caryophyllaceae. An annual herb growing to 15 cm in height, it is found on sandy soils, in coastal areas and on wasteland. Native to Europe, it is also naturalised in parts of North America, Australia and elsewhere. It is rare in Britain, except in the Scilly Isles.