The USBG(united states botanical garden) currently maitains about 12,000 accessions comprising more than 25,000 plants for exibition,study,conservation and exchange with other institutions.The plants includemedicinal,orchids,carnivorous,cacti and succulents, mid-Atlantic native plants and ferns.Historic specimens include some from1842 founding collection.George washington,Thomas jefferson and James Madisonshared the dream of this National mall way back in1820.
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