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prickly lettuce

Habit 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.

Involucres

9–10(–12) mm.

Florets

12–20;

corollas yellow, usually deliquescent.

Phyllaries

usually reflexed in fruit.

Heads

in paniculiform arrays.

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.

Lactuca serriola

Phenology Flowering (May–)Jul–Sep(–Oct).
Habitat Roadsides, disturbed sites
Elevation 10–2300 m (0–7500 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; AB; BC; MB; NB; NS; ON; PE; QC; SK; Europe [Introduced in North America; also introduced nearly worldwide]
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 19, p. 262.
Parent taxa Asteraceae > tribe Cichorieae > Lactuca
Sibling taxa
L. biennis, L. canadensis, L. floridana, L. graminifolia, L. hirsuta, L. ludoviciana, L. saligna, L. sativa, L. virosa
Name authority Linnaeus: Cent. Pl. II, 29. (1756)
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