Lactuca canadensis

Linnaeus
Sp. Pl. 2: 796. 1753.
Illustrated
Synonyms: Lactuca canadensis var. latifolia Kuntze Lactuca canadensis var. longifolia (Michaux) Farwell Lactuca canadensis var. obovata Wiegand Lactuca sagittifolia
Treatment appears in FNA Volume 19. Treatment on page 261. Mentioned on page 260.

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: Flowering Jun–Oct.
Habitat: Roadsides, swamps, salt marshes, thickets
Elevation: 0–2200 m

Distribution

V19-350-distribution-map.gif

B.C., Man., N.B., N.S., Ont., P.E.I., Que., Yukon, 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., Mexico, Central America, Eurasia.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Lactuca canadensis"
John L. Strother +
Linnaeus +
B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Yukon +, 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. +, Mexico +, Central America +  and Eurasia. +
0–2200 m +
Roadsides, swamps, salt marshes, thickets +
Flowering Jun–Oct. +
Illustrated +
Lactuca canadensis var. latifolia +, Lactuca canadensis var. longifolia +, Lactuca canadensis var. obovata +  and Lactuca sagittifolia +
Lactuca canadensis +
species +