Clicking on particular species will lead you to more information or photographs:
A camera indicates there are pictures. 
A speaker indicates there is a sound file demonstrating pronunciation
of the botanical name. 
A plus sign after a Latin name indicates that the species is further divided into varieties or subspecies. 
Your search found 46 taxa.
)
Common Name:
Fevertree, Pinkneya
1 or more sepals enlarged, petal-like, creamy to rose-colored, conspicuous, per Native Trees of the Southeast, An Identification Guide.
)
Common Name:
Buttonbush
Numerous sessile flowers radiating in dense spherical heads, per Forest Plants of the Southeast and Their Wildlife Uses.
)
Common Name:
Virginia Buttonweed
The white salverform flowers are sessile and borne in the leaf axils, per Wildflowers of Tennessee.
)
Common Name:
Poor-joe, Rough Buttonweed
SYNONYMOUS WITH
Revisión de las especies americanas del género Diodia (Bacigalupo & Cabral 1999)
Diodella teres
Pinkish funnelform flowers are 4-lobed, sessile, & borne in leaf axils, per Wildflowers of Tennessee.
)
Common Name:
woodland false buttonweed
SYNONYMOUS WITH (MISAPPLIED)
Manual of the Southeastern Flora (Small, 1933)
Borreria laevis
Calyx puberulent or hirtellous to glabrescent. Corolla white, funnelform, per Flora of China.
Common Name:
Shrubby Buttonweed, Whitehead Broom, Boton Blanco
SYNONYMOUS WITH
Borreria verticillata
)
Common Name:
Brazilian-clover, tropical Mexican-clover
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Richardia brasiliensis
Inflorescence terminal, enclosed by paired leaflike bracts, per Flora of China.
)
Common Name:
Rough Mexican-clover
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Richardia scabra
Corollas funnel-shaped, 3-10mm long (vs. R. brasiliensis only 3-7mm long), per Wildflowers of the Sandhills Region.
)
Common Name:
Partridgeberry, Twinflower
The two corollas are quite hairy inside & have their ovaries united, per Wildflowers of Tennessee.
SYNONYMOUS WITH
Aquatic & Wetland Plants of Southeastern US (Godfrey & Wooten, 1979 & 1981)
Hedyotis boscii
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Oldenlandia boscii
Common Name:
Diamond-flower
SYNONYMOUS WITH
Aquatic & Wetland Plants of Southeastern US (Godfrey & Wooten, 1979 & 1981)
Hedyotis corymbosa
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Oldenlandia corymbosa
)
Common Name:
Quaker Ladies, Common Bluet, Innocence
SYNONYMOUS WITH
Aquatic & Wetland Plants of Southeastern US (Godfrey & Wooten, 1979 & 1981)
Hedyotis caerulea
Corolla about 1/2" wide, blue to white with a yellow eye, per Wildflowers of the Southern Mountains.
)
Common Name:
Thyme-leaved Bluet, Appalachian Bluet, Prostrate Bluet, Marsh Bluet
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis michauxii
Blue-violet with a light yellow eye, 0.4"-0.5" across, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
)
Common Name:
Tiny Bluet, Small Bluet
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis crassifolia
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Houstonia minima
Four-lobed purple (rarely white) corolla with a reddish center, per Guide to the Plants of Granite Outcrops.
)
Common Name:
Southern Bluet
SYNONYMOUS WITH
The Genera of Cinchonoideae (Rubiaceae) in the southeastern US (Rogers, 1987)
Hedyotis australis
SYNONYMOUS WITH (MISAPPLIED)
Manual of the Southeastern Flora (Small, 1933)
Houstonia pusilla
Corollas white, 2.0-5.5mm long (vs. H. pusilla, purple or violet, 3.5-10+mm, per Weakley's Flora.
)
Common Name:
Roundleaf Bluet, Creeping Bluet, Trailing Bluet, Fairy-footprints
SYNONYMOUS WITH
The Genera of Cinchonoideae (Rubiaceae) in the southeastern US (Rogers, 1987)
Hedyotis procumbens
Flowers bright white, per Atlantic Coastal Plain Wildflowers.
)
Common Name:
Summer Bluet, Purple Bluet, Woodland Bluet
INCLUDED WITHIN
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis purpurea
Numerous white to lavender flowers on short pedicels in terminal cyme, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians.
SYNONYMOUS WITH
Manual of the Southeastern Flora (Small, 1933)
Houstonia lanceolata
SYNONYMOUS WITH
Hedyotis purpurea var. calycosa
)
Common Name:
Roan Mountain Bluet
SYNONYMOUS WITH
Hedyotis purpurea var. montana
Leaves ovate and shorter than H. purpurea, per Wildflowers of the Southern Mountains.
)
Common Name:
Canada Bluet
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis canadensis
Flowers similar to H. purpurea, per Wildflowers of the Eastern United States.
)
Common Name:
Eastern Longleaf Bluet
INCLUDED WITHIN
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis longifolia
Flowers funnel-shaped with 4 flaring lobes, at the ends of branches, per Newcomb's Wildflower Guide.
Common Name:
Granite Dome Bluet
INCLUDED WITHIN
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis longifolia
Common Name:
Diffuse-branched Bluet, Narrow-leaved Houstonia
SYNONYMOUS WITH
Manual of Vascular Plants of NE US & Adjacent Canada (Gleason & Cronquist,1991)
Hedyotis nuttalliana
INCLUDED WITHIN
The Genera of Cinchonoideae (Rubiaceae) in the southeastern US (Rogers, 1987)
Hedyotis longifolia
SYNONYMOUS WITH
Synthesis of the North American Flora (Kartesz, 1999)
Hedyotis nigricans var. nigricans
)
Common Name:
Field Madder, Blue Field Madder
Involucrate inflorescence & more tubular pink-purple flowers than other Galium, per Weakley's Flora.
)
Common Name:
Coastal Bedstraw
Corolla white, usually two flowers per cyme, per Vascular Flora of the Carolinas.
)
Common Name:
One-flower Bedstraw
Corolla white, usually only one flower per inflorescence, per Vascular Flora of the Carolinas.
)
Common Name:
Southern Forest Bedstraw, Wild-licorice
Greenish flowers sessile, widely spaced on forked branches in upper axils, per Wildflowers of the Southern Mountains.
)
Common Name:
Hairy Bedstraw
Flowers at ends of many branchlets, may be greenish-white or purplish, per Wildflowers of the Southern Mountains.
)
Common Name:
Cleavers, Bedstraw
3-5 lobed white corolla, single or in terminal and axillary clusters, per Forest Plants of the Southeast and Their Wildlife Uses.
)
Common Name:
Sweet-scented Bedstraw, Fragrant Bedstraw
Flowers in groups of 3 on long axillary and terminal peduncles, per Wildflowers of the Southern Mountains.
)
Common Name:
Purple Bedstraw, Wideleaf Bedstraw
Sepals usually obsolete. Corolla maroon, per Vascular Flora of the Carolinas.
)
Common Name:
Piedmont Crosswort, Piedmont Bedstraw
The corolla is yellow and minute, per Vascular Flora of the Carolinas.
)
Common Name:
Marsh Bedstraw, Dye Bedstraw
INCLUDED WITHIN
Manual of the Southeastern Flora (Small, 1933)
Galium claytonii
The only Bedstraw in the southern mtns with 3-lobed flowers, per Wildflowers of the Southern Mountains.
)
Common Name:
Rough Bedstraw
Leaves in whorls of 6. Principal leaves narrowly elliptic, up to 0.75" long, per Wildflowers of the Southern Mountains.
)
Common Name:
False Baby's Breath, Smooth Bedstraw, Hedge Bedstraw, Wild Madder
SYNONYMOUS WITH
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Galium mollugo var. mollugo
Flowers in a loose forked panicle. The plant erect and without prickles, per Wildflowers of the Southern Mountains.
INCLUDED WITHIN
Synthesis of the North American Flora (Kartesz, 1999)
Galium mollugo
SYNONYMOUS WITH
Britton & Brown Illus Flora of Northeast US & adjacent Canada (Gleason, 1952)
Galium mollugo var. erectum
)
Common Name:
Northern Bedstraw