Lactuca canadensis
Lactuca floridana
Canada lettuce, Canada wild lettuce, Canadian wild lettuce, Florida blue lettuce, tall lettuce, wild lettuce
Florida lettuce, woodland lettuce
on proximal 1/2–3/4 of each stem;
blades of undivided cauline leaves oblong, obovate, or lanceolate to spatulate or lance-linear, margins entire or denticulate, midribs sometimes sparsely pilose.
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.
10–12+ mm.
(8–)10–12+ mm.
15–20+;
corollas bluish or yellowish, usually deliquescent.
10–15(–25+);
corollas bluish or whitish, seldom deliquescent.
usually reflexed in fruit.
usually reflexed in fruit.
in ± corymbiform to paniculiform arrays.
in (± pyramidal) paniculiform arrays.
bodies brown (often mottled), ± flattened, elliptic, 5–6 mm, beaks ± filiform, 1–3 mm, faces 1(–3)-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.
= 34.
= 34.
Lactuca canadensis
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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