Sonchus arvensis L.
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Sonchus arvensis L., Sp. Pl. 793 (1753)
Sonchus arvensis L.
Nomenclature
L.
L.
1753
793
ICN
Sonchus arvensis L.
species
Sonchus arvensis
Classification
Vernacular names
Descriptions
Sonchus arvensis L.
Perennial. Roots creeping, perennating. Stem erect, simple or branched, finely grooved or ribbed, glabrous, 50-120 cm tall. Lvs firm, dark green, paler beneath, glabrous, oblong-lanceolate to lanceolate; margins coarsely dentate. Rosette and lower stem lvs tapering to base, 15-35 × 3-10 cm, pinnatifid to c. 1/2way to midrib; lobes deflexed, triangular to oblong. Upper lvs becoming less lobed, narrow-triangular to subulate, with rounded amplexicaul auricles at base. Infl. cymose-paniculate; capitula numerous. Involucre 15-18 mm long, turbinate to cylindric; bracts imbricate, spreading at fruiting, with tangled white short branching hairs and long yellow glandular setae. Receptacle with short scales and fine sparse short hairs. Florets 11/2× length of involucre; corolla tube a little > ligule; ligules spreading, yellow. Achenes elliptic, brown, weakly flattened, 3.5-3.8 × c. 1.5 mm, 5-ribbed on each face, not winged; ribs and spaces between conspicuously closely wrinkled. Pappus fine, white, = involucre.
Taxonomic concepts
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Metadata
f697644e-ec08-4d54-bed3-c2977d6c439f
scientific name
Names_Plants
1 January 2000
14 June 2006