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Erect, 1–3 dm, pyramidally branched, with short ascending branches beginning above the base; lvs membranous, linear or lance-linear, 1.5–5 cm, cuneate to a barely auriculate sessile base; cymes 3–15-fld, on slender axillary peduncles 4–10 mm; pedicels 1–3 mm; fls small, the hypanthium at an thesis mostly 1.5–2.5 mm, the caducous pet mostly 1–2 mm, deep rose-purple; anthers 4, yellow; sep triangular, shortly surpassed by the fr, this 2–3.5 mm thick; style persistent, 1.5–3 mm; ovary and fruit 4-locular; 2n=32. Borders of ponds, and similar wet places; N.D. to Tex., and irregularly pantropical, perhaps not entering our range, most of our plants so identified in the past being extremes of no. 2. [Ammannia coccinea Rottb.] July–Oct.
Herbs, 15-60 cm tall. Stems branched. Leaves opposite, narrowly lanceolate or oblong-lanceolate, l.5-7.5 cm × 3-15 mm, base cordate-auriculate, clasping. Flowers (1-)3-15, commonly ca. 7, in axillary cymes; pedicels 1-3(-6) mm; peduncle 3-9 mm, commonly ca. 5 mm; bracteoles linear, not reaching floral tube. Floral tube campanulate to urceolate, 1.5-2 mm, conspicuously 4-8-ribbed; sepals 4, broadly deltate; epicalyx segments minute, thickened. Petals 4, rose-purple, suborbicular, ca. 1.5 mm, sometimes absent. Stamens 4-8, long-exserted. Style ca. as long as or longer than ovary. Capsules 1.5-3(-3.5) mm in diam., equal to surpassing floral tube. Fl. Aug-Dec, fr. Aug-Dec. 2n = 30, 32.
Herb, erect, not greatly branched, to 40 cm high. Leaves sessile; lamina oblong-linear to lanceolate, 1–6 cm long, acute to acuminate, the base cordate-auriculate. Flowers in open axillary cymes; peduncle 6–9 mm long, rarely less; pedicel 1–6 mm long. Hypanthium campanulate, c. 1–1.5 mm deep; appendages reduced or absent. Sepals shortly triangular, c. 0.2 mm long. Petals orbicular, c. 1.5 mm long, purple. Stamens 4–8, exserted. Capsule globose, 1.5–3 mm diam., slightly exceeding hypanthium; dehiscence irregular-circumscissile.
Erect annual herb, 0.13-0.65 m high. Leaves flat, opposite, bases hastate. Flowers in lax axillary compound cymes; bracts less than half as long as calyx, one colour. Peduncles up to 6 mm long. Calyx lobes 4 or 5, with large appendages. Petals present. Stamens 4, exserted. Style 1.45-2.60 mm long. Flowers pink.
Annual herb, 6-45 mm tall. Primary peduncles (3-)6-14 mm long. Calyx appendages absent. Petals present. Style (1.0-)0.3-1.5 mm long. Mature fruits inflated and bubble-like, membranous-papery and shining, usually chestnut-coloured. Flowers pink or purple.
Leaves 15–80 × 3–14 mm., linear or sublanceolate, attenuate to the subacute apex, margin entire, sometimes minutely scabrous, 1-nerved, the nerve impressed above, prominent below, cordate-auriculate at the base (sometimes the lower ones cuneate).
Stem up to 5 mm. thick and subterete below, tapering upwards, the upper part of stem and the branches 4-gonous, narrowly winged to the apex, the wings sometimes scabrous.
Calyx-tube campanulate, 1–1·5 mm. long; lobes 4, deltoid, attaining 1/3–1/2 of the calyx-tube length; appendages 4, ± distinct, up to 0–5 mm. long.
Dichasia (2)3–15-flowered, loose, with the peduncle 4–10 (18) mm. long; bracteoles lanceolate.
Capsule 2–3·5 mm. in diameter, globose, equalling or slightly exceeding the lobes.
Ovary 1–1·5 mm. in diameter, globose; style 0·5–1·8 mm. long, filiform.
Annual erect simple or ± branched herb up to 65 cm. high.
Seeds c. 0·4 mm. long, brownish, concave-convex.
Flowers 4-merous, with pedicel 0·5–3 mm. long.
Petals obovate, 0·6–0·7 mm. long, pink.
Erect herb, 1–2 ft. high
Stamens 4–8, exserted.
Flowers pink
