Lactuca virosa
Lactuca floridana
bitter lettuce, great lettuce, poison wild lettuce, tall lettuce, wild lettuce
Florida lettuce, woodland 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 2/3–3/4 of each stem;
blades of undivided cauline leaves oblong, ovate, or elliptic, margins entire or denticulate, midribs sometimes sparsely pilose.
12–15 mm.
(8–)10–12+ mm.
10–15;
corollas yellow, usually deliquescent.
10–15(–25+);
corollas bluish or whitish, seldom deliquescent.
usually reflexed in fruit.
usually reflexed in fruit.
in paniculiform arrays.
in (± pyramidal) 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), ± compressed-lanceoloid to -fusiform, 4–5 mm, beaks ± stout, 0.1–0.5(–1) mm, faces 5–6-nerved;
pappi white, 4–5 mm.
= 18.
= 34.
Lactuca virosa
Lactuca floridana
The “double” pappi of Lactuca floridana (and L. biennis) are very similar to pappi found in species assigned to Cicerbita Wallroth (ca. 35 spp., Europe, Asia, Africa). Return of the species to Cicerbita as C. floridana (Linnaeus) Wallroth may have merit.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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