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|image_caption=''Jeffersonia diphylla'' from Britton & Brown 1913
|image_caption=''Jeffersonia diphylla'' from Britton & Brown 1913
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'''''Jeffersonia''''' which is also known as '''Twinleaf''' or '''Rheumatism root''', is a small [[genus]] of [[herbaceous]] [[perennial plant]]s in the family [[Berberidaceae]]. The two species are native to eastern [[Asia]] and eastern [[North America]]. They are uncommon spring wildflowers, which grow in [[limestone]] soils of rich woodland. ''Jeffersonia'' was named for [[United States]] [[President]] [[Thomas Jefferson]], by his contemporary [[Benjamin Smith Barton]].<ref >[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=116785 Flora of North America: Jeffersonia]</ref> This genus was formerly, incorrectly grouped in genus ''[[Podophyllum]]''. Twinleaf is protected by state laws as a threatened or endangered plant in Georgia, Iowa, New York, and New Jersey.<ref>[http://plants.usda.gov/java/profile?symbol=JEDI USDA PLANTS Database: Jeffersonia]</ref>
'''''Jeffersonia''''' which is also known as '''Twinleaf''' or '''Rheumatism root''', is a small [[genus]] of [[herbaceous]] [[perennial plant]]s in the family [[Berberidaceae]]. The two species are native to eastern [[Asia]] and eastern [[North America]]. They are uncommon spring wildflowers, which grow in [[limestone]] soils of rich woodland. ''Jeffersonia'' was named for [[United States]] [[President]] [[Thomas Jefferson]], by his contemporary [[Benjamin Smith Barton]].<ref >[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=116785 Flora of North America: Jeffersonia]</ref> This genus was formerly, incorrectly grouped in genus ''[[Podophyllum]]''. Twinleaf is protected by state laws as a threatened or endangered plant in Georgia, Iowa, New York, and New Jersey.<ref>[http://plants.usda.gov/java/profile?symbol=JEDI USDA PLANTS Database: Jeffersonia]</ref>
