Sonchus oleraceus |
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annual sow-thistle, common sow-thistle, laiteron, sow thistle |
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Habit | Annuals or biennials, 10–140(–200) cm. |
Stem | bases soft to hard, herbaceous, often hollow. |
Leaves | blades of mid cauline spatulate or oblong to obovate or lanceolate, 6–35 × 1–15 cm, bases auriculate, auricles deltate to lanceolate, ± straight, acute, margins usually pinnately (often runcinately) lobed, lobes ± deltate to lanceolate, not constricted at bases, terminals usually larger than laterals, entire or dentate. |
Peduncles | usually glabrous, sometimes stipitate-glandular. |
Involucres | 9–13+ mm. |
Corollas | ligules ± equaling tubes. |
Phyllaries | usually glabrous, sometimes tomentose and/or stipitate-glandular. |
Cypselae | dark brown, mostly oblanceoloid, 2.5–3.5+ mm, ribs 2–4 on each face, faces transversely rugulose or tuberculate across and between ribs; pappi 5–8 mm. |
2n | = 32, 36. |
Sonchus oleraceus |
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Phenology | Flowering (Apr–)Jul–Oct (year-round in south). |
Habitat | Disturbed sites, gardens, roadsides, along streams |
Elevation | 0–2000 m (0–6600 ft) |
Distribution |
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; SPM; Greenland; Europe [Introduced in North America; introduced also in Mexico, West Indies, Bahamas, Central America, South America, Africa, Asia, Pacific Islands (New Zealand), Australia]
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Source | FNA vol. 19, p. 275. |
Parent taxa | Asteraceae > tribe Cichorieae > Sonchus |
Sibling taxa | |
Name authority | Linnaeus: Sp. Pl. 2: 794. (1753) |
Web links |
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