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Calyx (1.5)2–3.5(4) mm long, 1.5–2.5(3) mm across at the base of the lobes, campanulate, sub-angled-ribbed, truncate or invaginated at the base, with scattered, stout, white or hyaline, ± spreading, long hairs, or puberulous especially along the ribs, on the inside glabrous except for the lobes with ± dense, minute indumentum towards the apex, near the margins and sometimes also along the midribs; lobes subequal, (0.3)0.5–1.2(1.5) × 0.7–1(1.2) mm, ± deltate or ovate-triangular to triangular-lanceolate, acute or obtuse, sometimes sub-acuminate, rarely sub-truncate; in fruit greenish, usually drying purple-veined, (10)12–20(23) × (8)10–15(20) mm, globose to ± ovoid, 10-angled-ribbed or 10-ribbed, slightly obtuse or apiculate at the summit, half to almost filled by the fruit, subglabrous to pilose, mostly with long hairs especially along the ribs and nerves, often the ribs with widely spaced small teeth or enations derived from the hair bases, the lobes (0.5)1–2.5(3) × 1–2 mm.
Leaves solitary or geminate; petiole 0.5–4.5(8) cm long, often slightly winged, rather sheathing at the base; lamina membranous or ± fleshy, 1.5–7.5(10.5) × 0.8–4.5(7.5) cm, ovate to lanceolate, sometimes rhombic, ovate-oblong, elliptic or oblanceolate, base shortly cuneate or attenuate, sometimes obtuse, rounded, truncate or subcordate, and often oblique or unequal-sided, sometimes ± decurrent into the petiole, apex acuminate, acute or obtuse, entire to somewhat coarsely sinuate-dentate, rarely dentate, the teeth unequal, ± triangular, obtuse, the sinuses rounded, both surfaces ± sparsely pilose or subglabrous but pubescent along the nerves and near the margins; minor leaves with lamina 0.5–0.7 × 0.3–0.4 cm, elliptic, sometimes present.
Corolla greenish-yellow or yellow to white or greenish-cream, slightly purplish marked or apparently unmarked, more rarely blotched with 5 ± dark purple to brown markings not strongly contrasting with the surrounding limb, (3)4–5(7) mm long, tubular-campanulate, often narrowly so; tube glabrous, on the inside with a few hyaline hairs from the insertion of the stamens upwards; limb (2)3–6 mm across, shortly 5-lobed, erect or spreading, rarely reflexed when fully expanded, glabrous or puberulous on the parts not folded in bud, glabrous inside, ciliate.
An annual herb. It grows 90 cm high. The stems are weak. It has many branches. It is covered with hairs. It is often tinged purple. The branches are angular. The leaf stalks can have wings and sheath the stem at the base. The leaf blade is 2-8 cm long by 1-5 cm wide. It can vary in shape. The flowers occur singly. They are at the side of the leaf stalk. The flowers are greenish-yellow. The fruit are yellow and 6-10 mm across. The seeds are light brown.
Erect to decumbent or prostrate, weak or occasionally ± robust, ± dichotomously much branched, annual herb, (0.05)0.1–1 m high (elsewhere said to reach 1.5 m), often tinged purple, ± clothed all over with simple, stout, often multicellular, white or hyaline, ± spreading, usually eglandular hairs 1–4 mm long, and also rigid, curved at the tip, appressed to spreading, often minute, hairs, furnished with ± sessile glands too.
Stamens included or slightly exserted, equal or subequal; filaments (1)1.5–3(3.5) mm long, filiform, attached to the corolla tube near the base, furnished with few hairs; anthers yellowish, sometimes blue-margined, 0.8–1 mm long, ± oblong or elliptic in outline, straight after anthesis.
Fruit greenish-yellow or pale yellow, occasionally yellow, subsessile or with a gynobase up to 1 mm long on the invaginated base of the erect to pendulous calyx, (5)6–10 mm in diameter, ± globose or slightly ovoid, viscid.
Branches angular or angular-ribbed, striate, drying ± sulcate, sparingly villous, with ± long hairs mainly on the emergent parts and also short and minute hairs somewhat localized near the nodes, occasionally subglabrous.
Flowers solitary, inserted by the side of the petiole-base appearing axillary, erect to pendulous; pedicel 2–5(9) mm long, villous or puberulous, occasionally subglabrous, in fruit elongated to 9(10) mm.
Seeds light brown or yellowish, (1.5)1.8–2 × (1.5)1.6–1.8(2) mm, ovate to orbicular in outline, sometimes reniform, reticulate-foveolate.
Ovary 0.8–0.9 × 0.6–0.7 mm, ellipsoid or ± globose, glabrous; style 2–3 mm long, filiform, ± curved upwards.
Disk 0.2–0.3 mm high, fleshy, glabrous.
