1. Breeding systems and pollination biology in Leguminosae;Arroyo,1981
2. Atlas of North American Astragalus;Barneby;Mem. New York. Bot. Gard.,1964
3. Curtis, W., 1792. Bot. Mag. 6, t. 181.
4. Leguminosae;Harvey,1933
5. Evaluation of genetic variability in Iberian Colutea spp. using isozyme electrophoresis;Hornero;Biochem. Syst. Ecol.,1997