Polycarpon tetraphyllum

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 153

1. P. tetraphyllum (L.) L., Syst. Nat. ed. 10, 2: 881 (1759).

Annual, rarely biennial or perennial, without a woody stock; stems much-branched. Leaves green, mostly in whorls of 4. Inflorescence lax, spreading, much-branched. Sepals mostly less than 2 mm; petals emarginate; stamens (l-)3-5. Seeds usually less than 0-5 mm, punctulate. Sandy or rocky places, usually inland. S. Europe, extending northwards in W. Europe to S.W. England; often casual elsewhere and locally naturalized. Al Az BI *Br Bu Co Cr G a *Ge G r Hs *Hu It Ju Lu Sa Si.