Emex Campd.

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 : 89

9. Emex Campd. 1

Annual herbs; monoecious. Ochreae not ciliate, soon lacerate. Female flowers at base of inflorescence; perianth-segments 6, free in male flowers, connate in female flowers, the outer 3 spinescent and indurated in fruit. Stamens 4-6. Stigmas 3. Nut triquetrous, included in perianth.