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.

Houstonia procumbens est une espèce de plantes vivaces de la famille des Rubiaceae. Elle est originaire du Sud-Est des États-Unis : Louisiane, Mississippi, Alabama, Géorgie, Floride et Caroline du Sud.

Houstonia procumbens là một loài thực vật có hoa trong họ Thiến thảo. Loài này được (Walter ex J.F.Gmel.) Standl. mô tả khoa học đầu tiên năm 1918.