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Annual herb; stems often dichotomously branched, and prostrate-spreading, or ascending, to 30(-60) cm long. Leaves in whorls or pseudowhorls of 3-6 or more per node, sessile; basal blade oblanceolate, narrowly obovate or spathulate, cauline blade oblong-linear, spathulate-lanceolate or linear, 5-35 x 0.8-13 mm, apex obtuse to acute, tapering to base. Inflorescence an axillary fascicle or umbellule, of (1-)2-5(-18) flowers; pedicels filiform, 3-15 mm long, usually shorter than leaves. Sepals 5, ovate, oblong or elliptical, 1.8-3 x 0.5-1.8 mm, acute or obtuse, 3-veined, green on veins, with white margin; petals usually absent; stamens 3(4-5), to 1.5 mm long. Capsule ovoid, ellipsoid or reniform, 2.5-3 x 1.5 mm; seeds numerous, cochleate-reniform, 0.5-0.6 mm, flattened, dark to light brown or orange, longitudinally ridged, smooth or papillose.
Annuals, prostrate to ascending, often falsely dichotomously branched. Leaves pseudoverticellate, 3-6 per node, unequal, generally oblong-linear, 1-3 cm. long, 1-2 mm. broad, more or less acute at the apex, gradually tapered to the base; sessile. Inflorescence axillary, modified cymose; pedicel 3-5 mm. long. Flowers with the tepals elliptic, about 2.0-2.5 mm. long, 0.5-0.75 mm. broad, persistent and subtending the fruit, glabrous; stamens 3, the filaments filiform, to 2 mm. long, connate at the very base, the anthers ovoid, about 0.25 mm. long and broad; ovary ovoid, 3-loculate, 1.0-1.5 mm. long, the styles 3, 0.5-0.75 mm. long, spreading. Capsule ovoid, 2-3 mm. long, about 1.5 mm. in diameter; seeds numerous, reni-form, about 0.5 mm. long and broad, the testa with several distinct ridges along the back and sides, brown.
Plants prostrate to ascending, 3-15 (-45) cm. Leaves not glaucous, in whorls of 3-8, basal rosette present, sometimes disappearing as plant matures; petiole 0.5-4 mm; blade linear to elliptic, obovate, or broadly spatulate, 5-40 × 0.5-15 mm, base cuneate, apex obtuse to rounded or acute. Inflorescences: flowers 2-6 in sessile, axillary umbels. Flowers: sepals green abaxially, white adaxially, oblong-elliptic, 1.5-2.5 × 0.5-1.2 mm, margins scarious; stamens 3[-4], alternate with carpels; pedicel erect-ascending at anthesis, erect to deflexed in fruit, 3-20 mm. Capsules ovoid-ellipsoid, 2.5-3.3 × 1.4-2.2 mm. Seeds 15-35, dark or reddish brown, with blackish, parallel, curved ridges on sides, or smooth, 0.5-0.6 × 0.4-0.5 mm. 2n = 64.
Herb, annual, prostrate or decumbent, with branches to c. 30 cm long. Leaves 4–6 (seldom more) per false whorl, linear to narrowly obovate, 4–25 mm long, 0.5–3 mm wide. Flowers solitary in axils or in small umbels; pedicels c. 1–5 mm long; perianth segments obovate, c. 1–2 mm long at anthesis, enlarging slightly in fruit, green with pale membranous margin; stamens 3; stigmas almost sessile. Capsule ellipsoid, c. 2.5 mm long, slightly exceeding perianth segments. Seeds reniform, c. 0.5 mm long, dark reddish-brown, smooth and shiny with 3–7 low dorsal ridges.
Glabrous annual, repeatedly forked, forming mats to 4 dm wide; lvs in whorls of 3–8, narrowly to broadly oblanceolate, 1–3 cm, tapering to a short petiolar base; fls 2–5 from each node, on pedicels 5–15 mm, pale green or white, 4–5 mm wide; stamens 3 or 4; fr ovoid, 3 mm; seeds numerous, arcuate-ridged; 2n=64. Apparently native to tropical Amer., but now a common weed in moist soil and dunes nearly throughout temperate N. Amer. June–Sept.
A creeping herb. It is 10-30 cm high. The leaf stalk is short. The leaves near the base are in a ring and are oval and cup shaped. They are 1.5-2 cm long. The leaves on the stem are about 7 in groups of 2 or 3. They are 1-3 cm long by 1.5-4 mm wide. The flowers occur in clusters of 3-5 flowers. They are greenish white. The fruit is a capsule. It is oval and 3-4 mm long by 2.5 mm wide. It has 3 valves. There are many kidney shaped seeds.
A glabrous annual.
