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Ruellia humilis  Nutt.
Riley County, Kansas
Height: 4-20 inches
Family: Acanthaceae - Acanthus Family
Flowering Period:   June, July, August, September
Also Called: Hairy ruellia, prairie petunia.
Stems: Erect, stout, branched, pubescent.
Leaves: Opposite, nearly sessile, ovate to lanceolate, 1 to 3 inches long, .5 to 1.5 inch wide, variously hairy; margins entire, fringed with hairs; tips mostly pointed.
Inflorescences: Solitary or clustered flowers in leaf axils.
Flowers: 5-parted; calyx lobes linear, long hairy, tips slender; corollas petunia-like, funnel-shaped, lavender to purplish, often with reddish lines inside, 1 to 3 inches long; stamens 4, in 2 groups; stigmas hook-shaped.
Fruits: Capsules, glabrous, brown; seeds flattened, reddish brown.
Habitat: Dry soils of prairies, open woodlands and slopes of rocky hills.
Distribution: East half of Kansas.
Comments: The flowers open at night and usually last only one day. They will also fall if the plant is shaken. Fringe-leaf ruellia is very drought resistant and is readily consumed by livestock.
 See limestone ruellia

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