Lactuca virosa
Lactuca graminifolia
bitter lettuce, great lettuce, poison wild lettuce, tall lettuce, wild lettuce
grass-leaf 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 1/3–1/2 of each stem;
blades of undivided cauline leaves spatulate to lance-linear, margins entire or denticulate, midribs sometimes setose.
12–15 mm.
12–20+ mm.
10–15;
corollas yellow, usually deliquescent.
15–20+;
corollas bluish to purplish, usually deliquescent.
usually reflexed in fruit.
usually reflexed in fruit.
in paniculiform arrays.
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 brown (often mottled), ± flattened, elliptic, 5–6 mm, beaks ± filiform, 2–4 mm, faces 1(–3)-nerved;
pappi white, 5–9 mm.
= 18.
= 34.
Lactuca virosa
Lactuca graminifolia
Plants in the western populations of Lactuca graminifolia have been called L. graminifolia var. arizonica McVaugh; they may belong to a Mexican species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
WA
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
LA Plants
