The large Gunnera’s (G. tinctoria and G. manicata) in Europe in relation to EU regulation 1143/2014

por van Valkenburg, Johan L. C. H., Osborne, Bruce A., Westenberg, Marcel
Publicado 2023

Pollen morphology of the African Sclerosperma (Arecaceae)

por Grímsson, Friðgeir, van Valkenburg, Johan L.C.H., Wieringa, Jan J., Xafis, Alexandros, Jacobs, Bonnie F., Zetter, Reinhard
Publicado 2018

Sclerosperma fossils from the late Oligocene of Chilga, north-western Ethiopia

por Grímsson, Friðgeir, Jacobs, Bonnie F., Van Valkenburg, Johan L. C. H., Wieringa, Jan J., Xafis, Alexandros, Tabor, Neil, Pan, Aaron D., Zetter, Reinhard
Publicado 2018