Lactuca serriola

Linnaeus

Cent. Pl. II, 29. 1756

Treatment appears in FNA Volume 19. Treatment on page 262. Mentioned on page 260.
Click plate for higher resolution version.
Illustrator: Marjorie C. Leggitt
Annuals (perhaps persisting), (15–)30–70(–100+) cm. Leaves on proximal 1/2–3/4 of each stem; blades of undivided cauline leaves usually ± oblong, sometimes obovate to lanceolate, margins denticulate, usually prickly, midribs usually prickly-setose, rarely smooth. Heads in paniculiform arrays. Involucres 9–10(–12) mm. Phyllaries usually reflexed in fruit. Florets 12–20; corollas yellow, usually deliquescent. Cypselae: bodies pale grayish to tan, ± flattened, oblanceolate, 2.5–3.5 mm, beaks ± filiform, 2.5–4 mm, faces (3–)5–9-nerved; pappi white, (3–)4–5 mm. 2n = 18.

Phenology: Flowering (May–)Jul–Sep(–Oct).
Habitat: Roadsides, disturbed sites
Elevation: 10–2300 m

Distribution

V19-356-distribution-map.gif

Alta., B.C., Man., N.B., N.S., Ont., P.E.I., Que., Sask., Ala., 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.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Europe, also introduced nearly worldwide.

Discussion

The name Lactuca scariola Linnaeus is evidently illegitimate; it is a superfluous name based on the same type as L. serriola. Plants included here in L. serriola with most leaf blades obovate to lanceolate (not lobed) and lacking prickles on midribs have been called L. scariola subsp. or var. integrata or L. serriola forma integrifolia or L. serriola var. integrata.

References

None.

Lower Taxa

No lower taxa listed.

Facts about "Lactuca serriola"
AuthorJohn L. Strother +
AuthorityLinnaeus +
DistributionAlta. +, B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ala. +, 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.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Europe + and also introduced nearly worldwide. +
Elevation10–2300 m +
HabitatRoadsides, disturbed sites +
IllustratorMarjorie C. Leggitt +
Introducedtrue +
PhenologyFlowering (May–)Jul–Sep(–Oct). +
Publication titleCent. Pl. II, +
Publication year1756 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V19-20-21/V19 356.xml +
SynonymsUndefined tribe Lactuceae +
Taxon familyAsteraceae +
Taxon nameLactuca serriola +
Taxon parentLactuca +
Taxon rankspecies +
VolumeVolume 19 +