Roundleaf Bluet

Houstonia procumbens (Walt.) Standley
Anonymos procumbens Walt. Fl. Car. 86. 1788.
Poiretia procumbens J. F. Gmel. Syst. 2: 263. 1791.
Houstonia rotundifolia Michx. Fl. Bor. Am. 1: 85. 1803.
Anotis rotundifolia DC. Prodr. 4: 433. 1830.
Hedyotis veronicaefolia Steud. Nom. ed. 2. 1: 729. 1840.
Hedyotis rotundifolia T. & G. Fl. N. Am. 2: 38. 1841.
Oldenlandia rotundifolia A. Gray; Chapm. Fl. S. U. S. 180. 1860.
Prostrate perennial, with filiform rootstocks or with long slender stems rooting at the nodes, copiously branched, the branches quadrangular, hirsutulous or glabrous, the internodes short or elongate; stipules minute, ciliate or naked; petioles 4 mm. long or shorter, usually hirsutulous; leaf-blades mostly suborbicular, sometimes oval or obovate, 5-15 mm. long, 2.5-15 mm. wide, broadly rounded at the apex or sometimes acutish, usually rounded at the base but sometimes cuneate, thin, bright-green above and hirsutulous or glabrous, paler beneath and glabrous, 1 -nerved, the margins plane or revolute, ciliate; flowers axillary, solitary, the pedicels slender, 16 mm. long or shorter, recurved in fruit, the plants in summer often producing fertile apetalous flowers; hypanthium about 1 mm. long, glabrous or hirsutulous; calyx-lobes as long, ovate-oblong, acutish; corolla salverform, 9-15 mm. long, white, the tube slender, ampliate above, the lobes ovate or oblong, acute, shorter than the tube, the throat hirsutulous; capsule subdidymous, 4-5 mm. broad, almost half inferior, hirsutulous or glabrous; seeds crateriform, rounded, 1-1.5 mm. broad, black, rough-scrobiculate.
Type locality: Carolina.
Distribution: In low, sandy soil, South Carolina to Florida and Louisiana.

Houstonia procumbens, the roundleaf bluet, is a perennial species in the family Rubiaceae. It is native to the southeastern United States: Louisiana, Mississippi, Alabama, Georgia, Florida and South Carolina. Its native habitats include disturbed sites, and moist, open, sandy areas. Flowers bloom March to October.