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Sonchus asper (L.) Hill
ROUGH SOW-THISTLE
Prickly Sow-thistle; Rough Sowthistle; Rough Milk Thistle; Spiny Sowthistle; Prickly Sowthistle; Sonchus oleraceus var asper L; Sonchus asper subsp glaucescens (Jord) Ball; Sonchus oleraceus var asper

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Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper
Sonchus asper
© Copyright Bobby Hattaway 2011 · 5
Sonchus asper

Associates · map
FamilyScientific name @ source (records)
Aphelinidae  Encarsia luteola @ UCRC_ENTA (3)

Encarsia @ UCRC_ENTA (15)

Eretmocerus @ UCRC_ENTA (41)
Aphididae  Aphis ( @ NCSU_ENT (1)

Hyperomyzus lactucae @ AMNH_PBI (14)

Uroleucon ( @ AMNH_PBI (1); NCSU (14)
Coccinellidae  Hippodamia convergens @ I_LB (1)
Coleosporiaceae  Coleosporium sonchi-arvensis @ BPI (4)

Coleosporium sonchi @ 786156B (1); BPI (32)
Entylomataceae  Entyloma calendulae @ BPI (2)
Erysiphaceae  Sphaerotheca castagnei @ BPI (2)
Miridae  Lygus lineolaris @ MEMU_ENT (8)

Spanagonicus albofasciatus @ MEMU_ENT (1)
Mycosphaerellaceae  Septoria sonchifolia @ BPI (3)
Peronosporaceae  Bremia lactucae @ BPI (7); 786156A (1)

Bremia sonchi @ BPI (3)
Pleosporaceae  Alternaria sonchi @ BPI (2)

Macrosporium commune @ BPI (2)
Pucciniaceae  Puccinia sonchi @ BPI (8)
_  Ascochyta sonchi @ BPI (2)

unknown unknown @ AMNH_PBI (3)

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FNA Vol. 19, 20 and 21 Page 273 , 274, 275 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Sonchus

2. Sonchus asper (Linnaeus) Hill, Herb. Brit. 1: 47. 1769.

Spiny-leaf sow-thistle, laiteron rude

Sonchus oleraceus Linnaeus var. asper Linnaeus, Sp. Pl. 2: 794. 1753

Annuals or biennials, 10—120(—200+) cm. Stem bases soft, herbaceous, hollow. Leaves: blades of mid cauline spatulate or oblong to obovate or lanceolate, 6—30 × 1—15 cm, bases auriculate, auricles often recurved or curled, rounded, margins often pinnately lobed, lobes ± deltate (not constricted at bases), terminals usually larger than laterals, usually prickly-dentate. Peduncles usually stipitate-glandular, sometimes glabrous. Involucres 9—13+ mm. Phyllaries usually stipitate-glandular. Corollas: ligules mostly shorter than tubes. Cypselae stramineous to reddish brown, mostly ellipsoid, strongly compressed, ± winged, 2—3 mm, ribs 3(—5) on each face, faces smooth across and between ribs; pappi 6—9 mm. 2 n = 18.

Flowering (Mar—)Jul—Nov (year-round in south). Disturbed sites, roadsides, along streams; 0—2500+ m; introduced; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Sask., Yukon; Ala., Alaska, Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo.; Europe, w Asia, n Africa; introduced also in Mexico, Central America, West Indies, Bermuda, South America, e Asia, s Africa, Pacific Islands (New Zealand), Australia.

L. Boulos (1973) distinguished subsp. asper (annuals with leaves mostly cauline, cypselae margins little or not at all curved and/or ciliate, and one pair of chromosomes with small satellites) from subsp. glaucescens (biennials with leaves mostly in rosettes, leaves mostly stiffer and more prickly than in subsp. asper , cypselae with curved, ciliate margins, and two pairs of chromosomes with large satellites) and noted that the two subspecies are morphologically rather difficult to distinguish if the specimen in hand lacks the rootstock or stem base.

According to H. N. Barber (1941), crosses between Sonchus asper and S. oleraceus resulted in sterile hybrids.

Updated: 2021-10-20 02:54:32 gmt
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