Compilation
Lactuca canadensis

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Name

Identification
Lactuca canadensis L. [family ASTERACEAE ] (stored under name); Verified by Not on sheet, Lactuca canadensis L. [family ASTERACEAE ] Verified by Not on sheet,
Related name
  • Lactuca angulata
  • Lactuca canadensis

Flora

Entry for Lactuca canadensis Linnaeus [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 19,
Names
Lactuca canadensis Linnaeus [family COMPOSITAE], Sp. Pl., 2: 796. 1753
Lactuca canadensis var. latifolia Kuntze [family COMPOSITAE]
Lactuca canadensis var. longifolia (Michaux) Farwell [family COMPOSITAE]
Lactuca canadensis var. obovata Wiegand [family COMPOSITAE]
Lactuca sagittifolia Elliott [family COMPOSITAE]
Treatment Author(s)
John L. Strother
Information
Biennials, (15–)40–200(–450+) cm. Leaves on proximal 1/2–3/4 of each stem; blades of undivided cauline leaves oblong, obovate, or lanceolate to spatulate or lance-linear, margins entire or denticulate, midribs sometimes sparsely pilose. Heads in ± corymbiform to paniculiform arrays. Involucres 10–12+ mm. Phyllaries usually reflexed in fruit. Florets 15–20+; corollas bluish or yellowish, usually deliquescent. Cypselae: bodies brown (often mottled), ± flattened, elliptic, 5–6 mm, beaks ± filiform, 1–3 mm, faces 1(–3)-nerved; pappi white, 5–6 mm. 2n = 34.
Phenology
jun-aug (summer), sep-oct (fall)
Altitude range
0–2200 m;
Distribution
MexicoCentral AmericaEurasia.USA Ala.USA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA D.C.USA Fla.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Md.USA Mass.USA Mich.USA Minn.USA Miss.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Oreg.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA W.Va.USA Wis.USA Wyo.Canada B.C.Canada Man.Canada N.B.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Yukon

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