Major Botanical Differences among Sonchus species.

Contributor:Dr. Pankaj OudhiaInteractive TableID: 1926
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Major Botanical Differences among Sonchus species.
CharactersSonchus asperSonchus brachyotusSonchus oleraceusSonchus wightianus
Plant    
LeavesAnnual herb, 15-70 cm high.Perennial erect herb, 10-100 cm high, with thick tap roots.Annual erect branched herb, 20-70 cm high.Perennial erect herb, 30-100 cm high, with creepig root stock.
HeadsLower leaves oblanceolate or spathulate, lobed or undivided, middle leaves often runicinate-pinnatifid, basal leaves dentate or subspinose at margins.Basal in rosette, middle leaves oblong or Spathulate oblong, upper leaves linear.Cauline, sessile, amplexicaul, ovate-oblong, with acute auricles, margins runcinate, upper leaves lanceolate.Linear-oblanceolate, lower leaves entire or pinnatifid with 4-5 pairs of lobes, middle and upper leaves lanceolate, acuminate, margins denticulate.
Achenes15 mm in diam, glandular peduncle; Involucral bracts many seriate; Corolla pubescent.15 mm in diam., on glandular hispid peduncles; Involucral bracts many seriate, Corolla bright yellow.1 cm in diam, in open panicles, peduncles glandular or eglandular-hairy, Involucral bracts many seriate.2 cm in diam, corymbose, peduncle glandualr hairy, Involucral bracts many seriate; Corolla sparsely pubescent.
 2.5-3.0 mm long, obovate, narrowly winged, 3 ribbed on each side, brown.3 mm long, linear-oblong, transversely rugose, 5-ribbed, brown.3 mm long, compressed, rugose, 3 ribbed, minutely muricate between the ribs.2.5 mm long, narrowly ellipsoid, tetragonous, transversal rugose.

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