(modifié de Coste, Flore de la France 1937) :
Plante vivace de 30-100 cm verte, à fibres radicales grêles; tige dressée, simple, rameuse au sommet, à rameaux dressés;
Écologie : (répartition d'après la flore) Prés, bois, pâturages, dans presque toute la France.
Répartition hors de France : Europe; Asie; Cap; Amérique.
(modified from Butcher, British Flora 1961):
NOTE: the French text is more complete and up-to-date
An erect perennial 30-75 cm high, with short, lax branches to the inflorescence.
Ecology UK: It is a very common plant of grassland and open woods throughout the British Isles.
France:
Distribution outside France: ?
Fleurs : dioïques, en panicule longue, lâche, nue
Floraison France : Mai-septembre.
* Souvent cultivé pour les usages culinaires.
Flowers: dioecious, red, drooping, on rather slender pedicels and forming small clusters on a lax raceme or panicle; outer perianth segments of female flower reflexed after flowering. Inner fruiting perianth segments 4.0 x 2.5 mm, cordate, each with a broad wing and a small basal tubercle.
Flowering UK: Early July-late Aug.
Please
consider 
