• Nitro Compounds in Introduced Astragalus Species

      Williams, M. C.; Davis, A. M. (Society for Range Management, 1982-01-01)
      Leaves of foreign Astragalus species were examined for the presence and type of poisonous aliphatic nitro compounds. Twenty-two (24%) of the 92 species examined tested positive for nitro compounds and 70 (76%) tested negative. Three nitro-bearing species, Astragalus bodeanus Fisch., Astragalus isfahanicus Boiss., and Astragalus siliquosus Boiss. synthesized 3-nitro-1-propanol (3-NPOH). The other nitro-bearing species synthesized 3-nitropropionic acid (3-NPA). Ten taxonomic sections had a high percentage of nitro-bearing species. Chemotaxonomic relationships in Astragalus suggest that most, if not all, of the other species in these 10 sections would synthesize nitro compounds.