Plantae | - | Equisetopsida | Rosales | Urticaceae
Ruas, M.-P. 1992. The archaeobotanical record of cultivated and collected plants of economic importance from medieval sites in France. Review of Palaeobotany and Palynology, 73: 301-314.
Callou C. [Ed.] Inventaires archéozoologiques et archéobotaniques de France (I2AF).