Lactuca virosa
Lactuca hirsuta
bitter lettuce, great lettuce, poison wild lettuce, tall lettuce, wild lettuce
hairy lettuce, tall hairy 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 1/3–2/3 of each stem;
blades of undivided cauline leaves ± ovate, margins denticulate (sometimes ± ciliate), midribs usually piloso-setose.
12–15 mm.
12–18+ mm.
10–15;
corollas yellow, usually deliquescent.
12–24+;
corollas usually yellow, sometimes drying bluish, usually deliquescent.
usually reflexed in fruit.
usually reflexed in fruit.
in paniculiform arrays.
in corymbiform to 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, ± flattened, elliptic, 4.5–5+ mm, beaks ± filiform, 2.5–3.5 mm, faces 1(–3)-nerved;
pappi white, 6.5–8(–10+) mm.
= 18.
= 34.
Lactuca virosa
Lactuca hirsuta
The type of Lactuca hirsuta may be conspecific with that of L. graminifolia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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