Plants herbs, annual. Stems erect to ascending, 3–6 dm, mostly glabrous. Leaves: petiole 5–15(–25) mm; blade oblong-lanceolate to elliptic-obovate, linear-lanceolate, or narrowly elliptic, 1.5–9(–12) cm, base rounded, margins crenate to serrate, each of proximal pair of teeth usually prolonged into caudate-setaceous point 3–5 mm, apex acute to acuminate, surfaces glabrous or sparsely hirsute on veins. Inflorescences solitary flowers or fasciculate or cymose, 2 or 3(or 4)-flowered. Pedicels 0–1 mm. Flowers: sepals linear-oblong to narrowly elliptic or narrowly obovate, 3–5 mm, not awned, glabrous; petals 3–5 mm; stamens 10–15(–20). Capsules cylindric, terete, not wing-angled, 3-valved, each valve terminated by bifurcate awn 1.5–2 mm, 20–40 × 1.5–2 mm, glabrous. 2n = 14.
An erect or suberect, 30-60 cm tall, annual herb. Stem and branches glabrous. Leaves 3-4-costate, oblong-lanceolate or linear-lanceolate or somewhat elliptic-obovate, 1.5-9 cm long, 0.6-2.2 cm broad, glabrous except the sparsely hairy veins, crenate-serrate, basal serratures prolonged into filiform spreading appendages or not, acute; petiole 5-12 mm long, hairy; stipules setaceous, 2-3 mm long. Cyme 1-3(-4)-flowered, antiphyllous, short peduncled. Flowers yellow, c. 1 cm across, subsessile; bracts subulate, 3-4 mm long. Sepals linear-oblong, 4-5 mm long, c. 2 mm broad, apiculate. Petals oblong, 3-4 mm long, c. 2 mm broad, obtuse. Stamens 10-15, filaments 4-5 mm long. Carpels 3; ovary cylindric, sulcate, 3-loculed, hairy; style small, stigma sparsely papillate. Capsules 1-3 together, erect, cylindrical, 1.5-4 cm long, c. 2 mm in diameter, not ribbed, glabrous, terminated by 3 spreading bifid tips, 3-loculed, locules aseptate. Seeds angular, obliquely truncate at both ends, black.
Seeds angular, oblong, dull dark brown, up to 0.5 mm in diameter, finely reticulate.
Capsule a slender cylinder, 2–4 cm long, 1–1.5 mm wide, held erect, straight or slightly curved, splitting into 3 valves, glabrous to sparsely setulose, ending in 3 spreading horns, these usually bifid.
Petals 4–5, 3.5–4.8 mm long, 0.5–1.5 mm wide, obovate, tapering to a short ciliate claw; stamens ± 10; ovary cylindric, 2–3 mm long, papillose.
Sepals 4–5, 3.5–4.3 mm long, 0.5–0.6 mm wide, glabrous or with odd hairs.
Inflorescences of 1–4-flowered glabrous fascicles; bracts up to 3 mm long, glabrous; peduncles ± 1 mm long; pedicels ± 1 mm long.
Leaves narrowly ovate, ovate or narrowly oblong, 3–11.5 cm long, 0.6–1(–3) cm wide, margins coarsely serrate, usually with a pair of basal setae 0.6–0.9 mm long, rounded at the base, acute to subacute, glabrous above, pubescent on midrib beneath and occasionally on blade; petioles 0.6–1.4 cm long, pilose especially on upper surface; stipules up to 5 mm, glabrous.
Annual herb, suberect or decumbent, up to 1 m tall; stems glabrous to sparsely pilose.
Sepals c. 5 mm. long, linear, slightly broader in the upper half, bluntly acuminate, glabrous.
Ovary trigonously cylindric, papillose, 3-locular; style c. 2 mm. long, glabrous.
Seeds c. 1·4 × 0·8 mm., numerous, dark brown, cylindric or somewhat quadrangular-cylindric.
Capsule up to c. 4 cm. long, held more or less erect, straight or slightly curved, usually somewhat ribbed, sparsely and minutely setulose-scabrid, terminated by 3 spreading horns c. 1 mm. long; valves only shallowly pitted inside to contain the seeds.
Androgynophore almost obsolete, but annulus visible and clasping the base of the ovary.
Petals yellow, the same length as the sepals, very narrowly oblanceolate, with a basal minutely ciliolate claw c. 0·3 mm. long.
Annual herb up to c. 0·6 m. tall, usually erect but with the older branches rather spreading; branchlets at first rather compressed or angular, glabrous or sparsely pilose.
Leaf-lamina 2·5–11 × 0·6–4·5 cm., oblong to lanceolate, acute at the apex, margin serrate or serrate-crenate, rounded at the base, glabrous or sparsely setulose-pubescent on the nerves; petiole up to 2 cm. long, pilose on the upper side; stipules up to 10 mm. long, setaceous, glabrous.
Inflorescences of 1–3-flowered leaf-opposed cymes; peduncles up to 1 mm. long, glabrous; pedicels similar, up to 1 mm. long; bracts 1–2 mm. long, setaceous, glabrous.
Erect or spreading annual herb, 0.6 m high. Capsule with 3 spreading horns at apex. Flowers yellow.
Herbe'annuelle, parfois suffrutescente, de 0,20-1 m de haut, ± ramifiée, glabre.'Feuilles'à stipules linéaires-filiformes, de 4-9 mm de long, persistantes; pétiole de 0,4-4 cm de long, pubescent aux bords; limbe lancéolé, oblancéolé à elliptique, tronqué et muni de 2 appendices filiformes à la base, acuminé à arrondi au sommet, de 2-11 cm de long et 0,5-3,5 cm de large, densément denté-serré, glabre; nervures basales 4.'Fascicules'oppositifoliés, 2-4-flores.'Fleurs'jaunes, glabres; pédicelle de ± 0,5 mm de long, glabre; bouton oblong-obovoïde, de ± 3 mm de long, courtement apiculé; sépales étroitement elliptiques à lancéolés, courtement apiculés, de ± 4 mm de long et ± 0,6 mm de large, glabres, caducs; pétales oblancéolés, courtement onguiculés, de ± 4 mm de long et 1,5 mm de large; disque annulaire, très court; étamines ∞; ovaire cylindrique, 3-6-côtelé, éparsement pubérulent à poils simples à l'extérieur, 3-loculaire; style plus court que l'ovaire, glabre; ovules co.'Capsules'cylindriques, de 2-4 cm de long et 0,12-0,2 cm de large, terminées par un bec 3-fide; valves 3, sans cloisons.'Graines ∞ cylindriques à rectangulaires, de 1,5 mm de long et 0,7 mm de large.
Annual herb about 0.6 m tall, usually erect but with its older branches rather spreading, branchlets at first rather compressed or angular, glabrous or sparsely pilose. Leaf-blade 25-110 x 6-45 mm, oblong to lanceolate, acute at the apex, rounded at the base, margin serrate or serrate-crenate, glabrous or sparsely setulose-pubescent on the nerves; petiole up to 20 mm long, pilose on the upper side; stipules up to 10 mm long, setaceous, glabrous. Inflorescence of 1-3-flowered leaf-opposed cymes; peduncles up to 1 mm long, glabrous; pedicels similar, up to 1 mm long; bracts 1-2 mm long, setaceous, glabrous. Sepals about 5 mm long, linear to slightly widened in the upper half, bluntly acuminate, glabrous. Petals yellow, as long as the sepals, very narrowly oblanceolate, with a minute basal claw about 0.3 mm long minutely ciliolate on the margin. Androgynophore almost obsolete but annulus visible and clasping the base of the ovary. Stamens 8-10, filamentous. Ovary trigonously cylindric, papillose, 3-locular; style about 2 mm long, glabrous. Capsule up to about 40 mm long, held more or less erect, straight or slightly curved, usually somewhat ribbed, sparsely and minutely setulose-scabrid, terminated by three spreading horns about 1 mm long; valves inside only shallowly pitted to receive the seeds; seeds numerous, dark brown, about 1.4 x 0.8 mm, cylindric or somewhat quadrangular-cylindric.