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Family	Scientific Name	Common Name	Habitat	Distribution	Image
Acanthaceae	Ruellia blechum	Green Shrimp-plant, Browne’s Blechum	Suburban woodlands, disturbed areas, escaped from horticultural use.	Native of the Neotropics.
Acanthaceae	Ruellia caroliniensis	Carolina Wild-petunia, Common Wild-petunia	Dry to moist forests and woodlands.	NJ, s. OH, s. IN, s. IL, and OK, south to s. FL and e. TX.
Acanthaceae	Ruellia ciliatiflora	Hairyflower Wild-petunia	Lawns, roadsides, mango and avocado plantations, other disturbed areas.	Native of South America. Reported for GA (Zomlefer et al. 2018).
Acanthaceae	Ruellia ciliosa	Sandhill Wild-petunia, Dwarf Wild-petunia	Longleaf pine sandhills, particularly in loamy, submesic swales.	Sc. NC south to c. peninsular FL, west to se. LA.
Acanthaceae	Ruellia corzoi	Corzo's Wild-petunia	Limestone hills and draws.	S., c., and w. TX south to ne. Mexico.
Acanthaceae	Ruellia dipteracanthus		Disturbed areas.	Native of the Neotropics. See Keith, Wright, & Godwin (2017) for first reports of naturalization in the United States (FL and TX).
Acanthaceae	Ruellia drummondiana	Drummond's Wild-petunia	Rocky riparian areas.	Endemic to TX.
Acanthaceae	Ruellia heteromorpha		Dry-mesic pinelands, marl prairies, pine rocklands.	S. peninsular FL.
Acanthaceae	Ruellia humilis	Low Wild-petunia, Hairy Wild-petunia, Fringeleaf Ruellia	Calcareous or mafic glades and woodlands, prairies, dry woodlands and fields.	S. PA west to se. MN and e. NE, south to c. NC, nc. SC (York County; Schmidt & Barnwell 2002), c. AL, s. MS, s. LA, and c. and s. TX.
Acanthaceae	Ruellia metziae	Metz's Wild-petunia	Open areas over calcareous gravels and calcareous woodlands.	Endemic to c. Texas, or alleged to also extend into n. Mexico (POWO 2024).
Acanthaceae	Ruellia noctiflora	Night-flowering Wild-petunia	Wet pinelands and savannas.	E. GA (in counties immediately adjacent to SC) south to ne. FL; Panhandle FL west to se. LA.
Acanthaceae	Ruellia nudiflora var. nudiflora	Violet Wild-petunia	Moist to dry woodlands and forests.	AL west to TX, south to s. Mexico and Central America.
Acanthaceae	Ruellia nudiflora var. runyonii	Runyon's Wild-petunia	Gravelly, calcareous soils of open areas and woodlands.	S. TX south into Mexico.
Acanthaceae	Ruellia occidentalis	Western Wild-petunia	Dry rocky woodlands and chaparral.	Se. and c. TX south through s. TX to n. Mexico.
Acanthaceae	Ruellia pedunculata	Stalked Wild-petunia	Dry woodlands and forests.	IL and MO south to w. LA and e. TX, with a few records east to w. KY and se. LA.
Acanthaceae	Ruellia pinetorum	Pineland Wild-petunia	Dry to wet pinelands and prairies.	SC south to Panhandle FL, west to e. TX.
Acanthaceae	Ruellia purshiana	Pursh's Wild-petunia	Dry woodlands and forests, especially over mafic or calcareous rocks.	MD south to c. GA and c. AL, in and adjacent to the Appalachians. Reported occurrences (Kartesz 2020) in w. TN and ne. LA are questionable and need verification. Found in MS on limestone bluffs and glade edges (J. Kees).
Acanthaceae	Ruellia simplex	Mexican Bluebell, Mexican Petunia	Disturbed areas, commonly cultivated, especially in maritime situations along the south Atlantic and Gulf coasts, persistent and spreading (including by seed) to adjacent areas.	Native of e. Mexico.
Acanthaceae	Ruellia strepens	Limestone Wild-petunia, Limestone Ruellia	Calcareous forests, woodlands, and fields.	NJ west to OH and IA, south to se., sc., and ne. NC, e. SC, AL, and TX.
Acanthaceae	Ruellia succulenta	Smooth Wild-petunia, Thickleaf Wild-petunia	Pine rocklands, mesic pine flatwoods, marl prairies, wet prairies, disturbed uplands.	Endemic to s. peninsular FL (Charlotte, Lee, Collier, Miami-Dade, and Monroe counties).
Acanthaceae	Ruellia yucatana	Yucatan Wild-petunia	Grasslands, on caliche, chaparral, thicket edges; eastwards in disturbed areas.	E. and c. TX southwards; also in s. Alabama in disturbed ground.