Sonchus arvensis subsp. arvensis

WeedyIntroduced
Treatment appears in FNA Volume 19. Treatment on page 274.

Peduncles stipitate-glandular. Phyllaries stipitate-glandular, longer 14–17 mm. 2n = 54.


Phenology: Flowering Jul–Sep.
Habitat: Disturbed sites, mostly wet, particularly in urban areas, roadside ditches, along streams
Elevation: 0–1600 m

Distribution

V19-377-distribution-map.gif

Introduced; St. Pierre and Miquelon, Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask., Alaska, Calif., Colo., Conn., Del., Idaho, Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nev., N.H., N.J., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Utah, Vt., Wash., Wis., Wyo., Europe, widely elsewhere

Discussion

Subspecies arvensis is considered a noxious weed in California, Idaho, Illinois, Iowa, Maryland, Minnesota, Nevada, North Dakota, South Dakota, and Wyoming.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

scarious +
ovate +  and lanceolate +
corymbiform +  and subumbelliform +
indeterminate +  and determinate +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
curved +  and straight +
6 cm60 mm <br />0.06 m <br /> (40 cm400 mm <br />0.4 m <br />) +
cauline +  and mid +
lobed;rounded;auriculate;oblong;lanceolate +
2 cm20 mm <br />0.02 m <br /> (?) +  and 15 cm150 mm <br />0.15 m <br /> (?) +
Philip E. Hyatt +
Linnaeus +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
curved +  and straight +
6 cm60 mm <br />0.06 m <br /> (40 cm400 mm <br />0.4 m <br />) +
cauline +  and mid +
lobed +, rounded +, auriculate +, oblong +  and lanceolate +
2cm;15cm +
compound +  and simple +
deltate +
not constricted +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
barbellulate +  and smooth +
zygomorphic +, actinomorphic +  and (3-)5-merous +
yellow +  and orange +
oblanceoloid +  and ellipsoid +
St. Pierre and Miquelon +, Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Alaska +, Calif. +, Colo. +, Conn. +, Del. +, Idaho +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nev. +, N.H. +, N.J. +, N.Y. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Utah +, Vt. +, Wash. +, Wis. +, Wyo. +, Europe +  and widely elsewhere +
0–1600 m +
transversely rugulose +  and tuberculate +
winged +  and beaked +
dispersed +
Disturbed sites, mostly wet, particularly in urban areas, roadside ditches, along streams +
indeterminate +
each +  and sessile +
connate +  and coherent +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
campanulate;urceolate +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
curved +  and straight +
6 cm60 mm <br />0.06 m <br /> (40 cm400 mm <br />0.4 m <br />) +
cauline +  and mid +
lobed +, rounded +, auriculate +, oblong +  and lanceolate +
2cm +  and 15cm +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
curved +  and straight +
cauline +  and mid +
lobed +, rounded +, auriculate +, oblong +  and lanceolate +
2cm +  and 15cm +
2-carpellate +
persistent +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
stipitate-glandular +
Flowering Jul–Sep. +
connate +  and distinct +
stipitate-glandular +
27 +  and 50 +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
flat;convex +
4 +  and 5 +
exalbuminous +
Weedy +  and Introduced +
woody +  and hard +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Sonchus arvensis subsp. arvensis +
Sonchus arvensis +
subspecies +
entire +  and dentate +
usually larger +
stoloniferous +  and rhizomatous +
150 cm1,500 mm <br />1.5 m <br /> (200 cm2,000 mm <br />2 m <br />) +
0 cm0 mm <br />0 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
shrub +  and subshrub +