Lactuca virosa
Lactuca sativa
bitter lettuce, great lettuce, poison wild lettuce, tall lettuce, wild lettuce
cultivated lettuce, garden lettuce
on proximal 1/2–2/3 of each stem;
blades of undivided cauline leaves obovate to spatulate, margins denticulate, midribs usually prickly-setose.
on proximal 1/2–3/4 of each stem;
blades of undivided cauline leaves ovate to orbiculate, margins entire or denticulate, seldom prickly, midribs rarely prickly-setose.
12–15 mm.
8–13+ mm.
10–15;
corollas yellow, usually deliquescent.
7–15(–30+);
corollas yellow (sometimes streaked with violet), usually deliquescent.
usually reflexed in fruit.
usually erect in fruit.
in paniculiform arrays.
usually in corymbiform, sometimes in paniculiform, arrays.
bodies purplish to blackish, ± flattened, ± elliptic, 3.5–4 mm, beaks ± filiform, 2.5–3.5 mm, faces 5–7-nerved;
pappi white, 5–6 mm.
bodies pale grayish to whitish or tan, ± flattened, obovate, 3–4 mm, beaks ± filiform, 3–5 mm, faces 5–9-nerved;
pappi white, 3.5–4+ mm.
= 18.
= 18.
CA
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
Go Botany
IL Wildflowers
MI Flora
MO Plants
