Herbs annual, 15-150 cm tall. Stem erect, much branched, green or purple-red striate, stout, ribbed; branches oblique or spreading. Leaf blade rhombic-ovate to broadly lanceolate, 3-6 × 2.5-5 cm, 1-2 × as long as petiole, abaxially ± farinose, adaxially usually glabrous, or sometimes reddish purple vesicular hairy on young leaves, base cuneate to broadly so, margin irregularly serrate, apex subobtuse or acute. Glomerules arranged into large or small panicles or spikelike panicles on upper part of branches. Flowers bisexual. Perianth segments 5, broadly ovate to elliptic, abaxially longitudinally keeled, farinose, margin membranous, apex acute or slightly emarginate. Stamens 5; anthers exserted. Stigmas 2. Pericarp adnate to seed. Seed horizontal, black, sublustrous, lenticular, 1-1.5 mm in diam., lineate, rim margin obtuse. Fl. and fr. May-Oct.
Stems erect to sprawling, simple to much-branched, 1-30 dm, sparsely to densely farinose. Leaves nonaromatic; petiole 1-2.5 cm, shorter than blades or occasionally longer; blade ovate-lanceolate to rhombic-lanceolate or broadly oblong, 1-5.5(-12) × 0.5-3.8(-8) cm, base narrowly to broadly cuneate, margins sinuous-dentate to shallowly serrate or entire, apex acute to subobtuse, farinose abaxially. Inflorescences glomerules or occasionally 1-flowered peduncles in terminal and lateral compound spikes, 2-19 cm; glomerules subglobose, 3-4 mm diam.; bracts absent. Flowers: perianth segments 5, distinct nearly to base; lobes ovate, ca. 1 × 1.1 mm, apex obtuse, keeled, farinose, largely covering fruit at maturity; stamens 5; stigmas 2, 0.2-0.3 mm. Utricles depressed-ovoid; pericarp nonadherent, occasionally adherent, smooth to papillate. Seeds lenticular, margins round, 0.9-1.6 mm diam.; seed coat black, smooth, indistinctly granulate and/or radially grooved, or with faint reticulate-rugose ridges. 2n = 54.
"Erect annual, much branched and to 1 m when well developed, the stems only seldom pigmented at the nodes, the lvs and infl often turning reddish late in the season; lvs generally ± white-mealy, rhombic-ovate to lanceolate, 3–10 cm, broadly cuneate at base, the larger (lower) ones mostly 1.5–2+ times as long as wide and almost always toothed; fls in dense glomerules, forming interrupted or continuous spikes that are grouped into a terminal paniculiform infl; cal ± white- mealy, its segments ± strongly carinate or cucullate, covering the fr, or sometimes looser and exposing the fr; style divided to the base, wholly deciduous; pericarp very thin and delicate, closely adherent to the seed and usually scarcely separable from it, smooth or only obscurely roughened when viewed at 10× or even 20×, uniformly black or blackish; seeds horizontal, black, shining, mostly 1.0–1.5 mm wide, usually marked with a faint radial furrow, otherwise smooth or nearly so; 2n=54. June–Oct. Polymorphic European weed, now widely intr. in N. Amer. and elsewhere. Sometimes divided into an indefinite number of infraspecific taxa or specific segregates. (C. glaucophyllum; C. lanceolatum, a relatively narrow-lvd form) In our range the two following segregates are particularly noteworthy and probably merit some sort of taxonomic recognition."
Annual, 10-150 cm, usually erect, variously branched, ± grey farinose. Stems yellowish to green, green-striated, sometimes reddish or with red spots at leaf axils. Lower and medium leaves petiolate, blade usually 2-6(-10) cm, variously trullate, rhombic-ovate to lanceolate, clearly longer than broad, base narrowly to broadly cuneate, margins irregularly serrate to entire, often somewhat 3-lobed, teeth mostly acute, often unequal in size; uppermost leaves lanceolate, usually entire. Inflorescence a variable spiciform or cymosely branched panicle, mostly terminal. Perianth segments 5, dorsally keeled. Perianth falling with fruit. Pericarp thin, ± adherent. Seeds horizontal, black, 1.1-1.5 mm in diameter, somewhat ovate, margin weakly acute; testa with faint radial striae, otherwise almost smooth.
Pericarp somewhat persistent, but easily rubbed or scraped off seed. Seeds black, shining, 1.2–1.6 (1.85) mm. in diam., bluntly keeled; testa (see under microscope) marked with faint irregular radial furrows, but otherwise almost smooth.
Perianth segments 5, papillose with grey mealy hairs on margins and outside, each with a prominent green keel in upper part.
Inflorescence a usually ample pancile of very numerous small or medium-sized (2–6 mm. in diam.) densely or laxly spicately or cymosely arranged dense rounded clusters (“glomerules”) of minute grey to green flowers, the latter 1–1.5 mm. in diam.
Leaves very variable even on a single plant, rhombic-ovate to lanceolate, usually distinctly longer than broad by at least 14 times (but the juvenile leaves following the cotyledons may be almost as broad as long), 1.2–8.2 × 0.3–5.5 cm.; leaf-margins entire or more commonly with up to about 10 shallow irregular teeth on each side, the lowermost tooth or lobe on each margin sometimes more prominent than the rest; apex of each margin sometimes more prominent than the rest; apex of leaf acute, or particularly in the lower cauline leaves subacute to rounded; superior leaves and bracts progressively smaller.
Annual herb usually 10–150 cm. high, normally, much branched, but sometimes stems simple or subsimple especially in small plants; plant green or tinged red especially on stem (which is often red or pink striped), more or less clothed with grey-mealy hairs especially on young parts.
Herb usually 10–150 cm. high, annual, normally much branched but sometimes lateral branches short and stem thus appearing subsimple, green or red-tinged, especially on stem, more or less grey-mealy especially on young parts.
Leaves very variable, rhombic-ovate to lanceolate, mostly distinctly longer than broad by normally at least 1½ times (but the juvenile leaves following the cotyledons may be almost as broad as long), from about 1.2 x 0.3 and 2.3 x 1.3 cm. to 5.4 x 3.1, 6.5 x 3.8, 7 x 1.5, 7 x 3.7 and 8.2 x 5.5 cm., margins entire or more commonly with up to about 10 shallow teeth each side, prominent basal lobes not commonly present, apex of leaf acute, or particularly in the lower cauline leaves subacute to rounded; upper leaves and bracts progressively smaller.
Sepals 5, papillose on margins and outside, each with a prominent green keel in upper part.
Inflorescence a usually ample panicle of very numerous small or medium (2–6 mm. in diameter) densely or laxly spicately or cymosely arranged dense rounded clusters (“glomerules”) of minute grey to green flowers, latter 1–1.5 mm. in diameter.
Pericarp somewhat persistent but easily rubbed or scraped off seed.
Seeds (Fig. 1, p. 2) black, shining, 1.2–1.6 (–1.85) mm. in diameter, bluntly keeled, testa under microscope marked with faint radial furrows further apart than in C. opulifolium, otherwise almost smooth.
30–100 cm hoch, mit meist aufrecht abstehenden Zweigen, ± dicht mit Mehlstaub belegt und daher meist graugrün. Blätter vielgestaltig: oval, lanzettlich oder rhombisch, unregelmässig gezähnt bis gelappt (nur selten ganzrandig), die meisten mehr als
Erect annual herb, up to 1.5 m high. Leaves lanceolate-ovate to subtrilobed; petioles slender, up to 40 mm long. Flowers in dense leafless terminal panicles, overtopping leaves. Flowers green.
Espèce très voisine de la précédente et de port identique; elle en diffère, d'une part, par les feuilles moyennes au moins 2 fois plus longues que larges et souvent plus grandes (jusqu'à 7-8 cm de long et 2-3 cm de large) à dents plus nombreuses, les supérieures de plus en plus étroites et moins dentées, et par une pruinosité souvent plus marquée (caractère très variable) et, d'autre part, par ses akènes à péricarpe se détachant facilement (par frottement entre les doigts) de la graine, qui est plus comprimée, à arête aiguë ou même carénée.
Annual herb, up to 1 m high. Stems erect or drooping, ribbed. Leaves petiolate; blade ovate, narrowly ovate to subtrilobed, variable in size, margins entire, toothed or lobed, upper surface dark green, lower surface with a thick whitish, mealy covering; petioles slender, up to 40 mm long. Flowers: in dense, leafless, terminal panicles, overtopping leaves; perianth green; Dec.-Apr.
Espèce typiquement rudérale et nitrophile extrêmement répandue comme « mauvaise herbe » dans les régions tempérées, mais jusqu'à présent très rarement observée au Congo belge.
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