Flora of North America species comparison

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Lactuca canadensis

Canada lettuce, Canada wild lettuce, Canadian wild lettuce, Florida blue lettuce, tall lettuce, wild lettuce
Habit 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.
Involucres

10–12+ mm.
Florets

15–20+;

corollas bluish or yellowish, usually deliquescent.
Phyllaries

usually reflexed in fruit.
Heads

in ± corymbiform to paniculiform arrays.
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.

Lactuca canadensis
Phenology Flowering Jun–Oct.
Habitat Roadsides, swamps, salt marshes, thickets
Elevation 0–2200 m (0–7200 ft)
Distribution
from FNA
AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; BC; MB; NB; NS; ON; PE; QC; YT; Mexico; Central America; Eurasia
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 261.
Parent taxa Asteraceae > tribe Cichorieae > Lactuca
Sibling taxa
L. biennis, L. floridana, L. graminifolia, L. hirsuta, L. ludoviciana, L. saligna, L. sativa, L. serriola, L. virosa
Synonyms L. canadensis var. latifolia, L. canadensis var. longifolia, L. canadensis var. obovata, L. sagittifolia
Name authority Linnaeus: Sp. Pl. 2: 796. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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