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A plus sign after a Latin name indicates that the species is further divided into varieties or subspecies. 
Your search found 13 taxa.
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Common Name:
American Barberry, Allegheny Barberry
Flower clusters drooping, with 3-12 yellow flowers, per Field Guide to the Rare Plants of Georgia.
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Common Name:
Japanese Barberry
Inflorescences umbellate, 1-5 flowered, 1-1.5cm, per Flora of North America.
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Common Name:
Evergreen Barberry, Wintergreen Barberry
Flowers 10-25-fascicled. Berberis's superior ovary symmetrically club-shaped, per Flora of China.
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Common Name:
European Barberry, Common Barberry
Inflorescences racemose, lax, 10-20-flowered, per Flora of North America.
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Common Name:
Leatherleaf Mahonia, Chinese Mahonia, Holly-grape
Axillary racemes of bright yellow flowers, per Native Shrubs and Woody Vines of the Southeast.
Common Name:
Cascade Oregon Grape, Cascades Mahonia
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Common Name:
Creeping Oregon Grape
Leaves (3-)5-7 foliolate. Inflorescences racemose, dense, 25-50 flowered, per Flora of North America.
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Common Name:
Nandina, Heavenly Bamboo, Sacred-bamboo
All perianth parts caducous [falling off early]; sepals & petals intergrading, per Flora of North America.
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Common Name:
Twinleaf
Solitary flowers on leafless stems last only a day or so in March or April, per Gardening with the Native Plants of Tennessee.
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Common Name:
Common Blue Cohosh, Papooseroot, Green Vivian
The six petal-like sepals are yellow-green to purple-green, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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Common Name:
Umbrella-leaf, Pixie-parasol
Unlike most other dicots, the sepals, petals & stamens number 6 each, per Wildflowers of the Eastern United States.
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Common Name:
May-apple, American Mandrake
Corolla white, firm; petals 6-9, stamens usually 12-18; stigma sessile, per Vascular Flora of the Carolinas.
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