Trans. Amer. Philos. Soc., n. s. 5: 141. 1835.
Leaves connate at base, spatulate-obovate, 1.4–2.3 × 0.4–1.5 mm, 2+-veined. Stem and leaf scales present. Inflorescences: bracts absent. Pedicels 0 mm in fruit. Flowers not solitary, usually 1 staminate and 1 pistillate in 1 axil opposed by 1 pistillate; styles erect to reflexed; pollen yellow. Schizocarps 0.4–0.7 × 0.7–0.9 mm, shorter than wide; mericarps black, swollen at base, not winged or winged only at apex, wings straight, 0–0.03 mm wide. 2n = 10.
Phenology: Flowering (Jan–)Feb–Apr(–May), Oct–Dec.
Habitat: Seasonally damp hollows, sandy soils in woodlands, gardens, waste grounds, rocky areas.
Elevation: 0–100 m.
Ala., Ark., Calif., Fla., Ga., La., Miss., Tex., introduced in Asia (China, Taiwan), Indian Ocean Islands (Madagascar, Réunion), Pacific Islands (New Zealand).
Three varieties of Callitriche peploides have been recognized (N. C. Fassett 1951b). A collection reported as a weed of a container in a nursery in San Bernardino County, California (T. C. Fuller 1967) is referable to var. semialata. The characters used to distinguish these varieties do not appear reliable, and it seems best to disregard them (R. V. Lansdown and M. J. M. Christenhusz 2011).