Lactuca sativa |
Lactuca floridana |
|
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cultivated lettuce, garden lettuce |
Florida lettuce, woodland lettuce |
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Habit | Annuals or biennials, (15–)30–70(–100+) cm. | Annuals or biennials, 25–150(–200+) cm. |
Leaves | on proximal 1/2–3/4 of each stem; blades of undivided cauline leaves ovate to orbiculate, margins entire or denticulate, seldom prickly, midribs rarely 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. |
Involucres | 8–13+ mm. |
(8–)10–12+ mm. |
Florets | 7–15(–30+); corollas yellow (sometimes streaked with violet), usually deliquescent. |
10–15(–25+); corollas bluish or whitish, seldom deliquescent. |
Phyllaries | usually erect in fruit. |
usually reflexed in fruit. |
Heads | usually in corymbiform, sometimes in paniculiform, arrays. |
in (± pyramidal) paniculiform arrays. |
Cypselae | bodies pale grayish to whitish or tan, ± flattened, obovate, 3–4 mm, beaks ± filiform, 3–5 mm, faces 5–9-nerved; pappi white, 3.5–4+ 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. |
2n | = 18. |
= 34. |
Lactuca sativa |
Lactuca floridana |
|
Phenology | Flowering mostly Jul–Sep. | Flowering (Jun–)Aug–Sep(–Oct). |
Habitat | Disturbed sites, abandoned plantings | Moist to wet places, margins of thickets and woods |
Elevation | 10–1000 m (0–3300 ft) | 10–200 m (0–700 ft) |
Distribution |
AL; CA; CT; DC; DE; ID; IL; IN; MA; ME; MI; MO; NC; ND; NH; NJ; NM; NY; OH; OK; OR; PA; RI; VT; WA; WV; ON; Eurasia [Introduced in North America; introduced also in Mexico; introduced or ephemeral nearly worldwide]
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AL; AR; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; NC; NE; NJ; NY; OH; OK; PA; SC; SD; TN; TX; VA; WI; WV; MB; ON
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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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 19, p. 263. | FNA vol. 19, p. 261. |
Parent taxa | Asteraceae > tribe Cichorieae > Lactuca | Asteraceae > tribe Cichorieae > Lactuca |
Sibling taxa | ||
Synonyms | Sonchus floridanus, L. floridana var. villosa, Mulgedium floridanum | |
Name authority | Linnaeus: Sp. Pl. 2: 795. (1753) | (Linnaeus) Gaertner: Fruct. Sem. Pl. 2: 362. (1791) |
Web links |