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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 32 taxa.
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Common Name:
American Bluehearts, Prairie Bluehearts, Plains Bluehearts
Corolla lobes longer 5-8mm long (vs. those of B. floridana less than 5mm), per Vascular Flora of the Carolinas.
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Common Name:
Savanna Bluehearts, Florida Bluehearts, Buchnera
Flowers tubular below, spreading at apex into 5 petals, borne in a spike, per Atlantic Coastal Plain Wildflowers.
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Common Name:
Witchweed
Stems erect, rarely branched. Corolla tube apically strongly curved, per Flora of China.
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Common Name:
Senna Seymeria
Flowers with 5 rounded lobes, two of which are partially united, per Forest Plants of the Southeast and Their Wildlife Uses.
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Common Name:
Seymeria
Corolla of S. pectinata is pubescent externally [vs. S. cassinoides' glabrous], per Weakley's Flora.
Common Name:
Fern-leaf False-foxglove, Annual Oak-leach
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Common Name:
Southern Oak-leach, Sticky False-foxglove
Plant pubescent (esp on calyx, corolla, capsule, lower stem) w glandular hairs, per Weakley's Flora.
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Common Name:
Downy False-foxglove, Downy Oak-leach, Virginia Oak-leach
Flowering May-July (vs. Aug-Sept for A. patula, laevigata, flava), per Weakley's Flora.
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Common Name:
Appalachian Oak-leach, Smooth False-foxglove
Inflorescence, pedicels and calyx glabrous; flowering Aug-Sep, per Weakley's Flora.
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Common Name:
Smooth False-foxglove, Eastern Smooth Oak-leach
Inflorescence, pedicels and calyx glabrous, flowering Aug-Sep, per Weakley's Flora.
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Common Name:
Cumberland Oak-leach, Spreading Yellow Foxglove
Flowers, sepals and flower stalk covered with tiny soft hairs, per Field Guide to the Rare Plants of Georgia.
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Common Name:
Gerardia, flaxleaf false foxglove
Flowers in racemes, 1-2 per node. Corolla tube lacks yellow lines, per Guide to the Wildflowers of SC.
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Common Name:
Purple Gerardia, purple false foxglove
Flowers are between 0.75" & 1.5" long on extremely short stalks, per Wildflowers of the Southern Mountains.
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Common Name:
Gerardia, beach false foxglove
Corolla throat usually yellow-lined within, per Vascular Flora of the Carolinas.
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Common Name:
Gerardia, beach false foxglove
Pedicels shorter than the calyx, per Wildflowers of the Eastern United States.
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Common Name:
Sandhills Gerardia, Threadleaf Gerardia, threadleaf false foxglove
Corolla lobes all spreading, the throat lanose at base of upper corolla lobes, per Vascular Flora of the Carolinas.
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Common Name:
Slender Gerardia, Thin-leaved Agalinis, slenderleaf false foxglove
Throat of the light purple corolla is not hairy like other related species, per Guide to the Plants of Granite Outcrops.
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Common Name:
Mullein Foxglove
Flowers densely hairy within, about 0.6" long, and last for one day, per Wildflowers of Tennessee.
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Common Name:
Chaffseed
Flowers axillary, solitary, per Vascular Flora of the Carolinas.
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Common Name:
Eastern Indian Paintbrush
Greenish-yellow flowers in terminal spikes subtended by red leaf-like bracts, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont.
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Common Name:
Wood Betony, Eastern Lousewort, Fernleaf
Flowers form an array of yellow or reddish bent tubes, each with 4 lobes, per Southern Appalachian Wildflowers.
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Common Name:
Swamp Lousewort
Flowers creamy yellow, ~ 1" long, 2-lipped corolla, upper lip helmetlike, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
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Common Name:
Cow-wheat
Corolla 2-lipped: upper lip hooded, lower lip with a yellow palate, per Wildflowers of Tennessee.
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Common Name:
Beechdrops
Upper flowers 3/8", 2-lipped w 4 short lobes, usually yellowish or purplish, per Wildflowers of the Southern Mountains.
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Common Name:
Squawroot, Bearcorn
A 1/2" whitish 2-lipped flower projects from the stem above each bract, per Wildflowers of the Southern Mountains.
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Common Name:
One-flowered Cancer-root, One-flowered Broomrape
Corolla tubular & slightly curved, 3/4" long, with 5 spreading lobes, per Wildflowers of the Southern Mountains.
Your search found 32 taxa. You are on page PAGE 1 out of 1 pages.