A modern reference to temperate woody plants, including updated content from this site and much new material, can be found at Trees and Shrubs Online.




A genus of three shrubby species in Spain and N. Africa. Flowers yellow, with clawed petals, borne in racemes. Filaments of inner stamens paired and connate. The elongated pod-like fruit is of distinctive shape: it is constricted around the middle and only the lower portion is fertile, the upper sterile part forming a beak.

Species articles