Natural products and botanical medicines of Iran Natural Products and Botanical Medicines of Iran The Boissier plants taxonomy method Spermatophytes Angiosperms Dicotyledons Dialypetalaes Spermatophytes Angiosperms Dicotyledons Sympetalaes Spermatophytes Angiosperms Dicotyledons Monochlamydeaes Spermatophytes Angiosperms Monocotyledons Spermatophytes Gymnosperms Cryptogamaes Pteridophytes Cryptogamaes Non vascular plants.