Compilation
Lactuca floridana

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Name

Identification
Lactuca floridana (L.) Gaertn. [family ASTERACEAE ]
Related name
  • Lactuca floridana

Flora

Entry for Lactuca floridana (Linnaeus) Gaertner [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 19,
Names
Lactuca floridana (Linnaeus) Gaertner [family COMPOSITAE], Fruct. Sem. Pl., 2: 362. 1791
Sonchus floridanus Linnaeus [family COMPOSITAE], Sp. Pl., 2: 794. 1753
Lactuca floridana var. villosa (Jacquin) Cronquist [family COMPOSITAE]
Mulgedium floridanum (Linnaeus) de Candolle [family COMPOSITAE]
Treatment Author(s)
John L. Strother
Information
Annuals or biennials, 25–150(–200+) cm. Leaves 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. Heads in (± pyramidal) paniculiform arrays. Involucres (8–)10–12+ mm. Phyllaries usually reflexed in fruit. Florets 10–15(–25+); corollas bluish or whitish, seldom deliquescent. Cypselae: 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. 2n = 34.
Phenology
jun, aug (summer), sep-oct (fall)
Altitude range
10–200 m;
Distribution
USA Ala.USA Ark.USA Del.USA D.C.USA Fla.USA Ga.USA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA Md.USA Mass.USA Mich.USA Miss.USA Mo.USA Nebr.USA N.J.USA N.Y.USA N.C.USA OhioUSA Okla.USA Pa.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA Va.USA W.Va.USA Wis.Canada Man.Canada Ont.
Discussion
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.

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