Home Flora of Missouri
Name Search
Lactuca floridana (L.) Gaertn. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in NYBG Virtual HerbariumSearch in Muséum national d'Histoire naturelleSearch in Type Specimen Register of the U.S. National HerbariumSearch in Virtual Herbaria AustriaSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical GardenAfrican Plants, Senckenberg Photo GallerySearch in Flora do Brasil 2020Search in Reflora - Virtual HerbariumSearch in Living Collections Decrease font Increase font Restore font

Published In: De Fructibus et Seminibus Plantarum. . . . 2(3): 362. 1791. (Fruct. Sem. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


Export To PDF Export To Word

2. Lactuca floridana (L.) Gaertn. (Florida lettuce, woodland lettuce)

Pl. 258 c, d; Map 1078

Plants annual or biennial. Latex plants white. Stems 40–250(–350) cm long, hollow between the nodes, glabrous, often purple-spotted. Leaves well developed along the stems, extremely variable; the basal and lower stem leaves mostly 7–35(–45) cm long, sessile or more commonly with a winged petiole, narrowly ovate, ovate, or obovate in outline, variously toothed and/or deeply pinnately lobed, the margins sometimes minutely hairy, sometimes with a pair of narrowly triangular basal lobes clasping the stem, the undersurface sometimes short-hairy, especially along the midvein; the middle and upper stem leaves mostly lanceolate to ovate, or obovate, pinnately lobed to nearly entire, the margins usually glabrous, sometimes with a pair of narrowly to broadly triangular basal lobes clasping the stem, the undersurface glabrous. Inflorescences mostly well-branched panicles with 50–100 or more heads. Involucre cylindrical or urn-shaped, 8–9 mm long at flowering, elongating to 10–14 mm at fruiting, the bracts 14–17. Florets 10–17(–25). Corollas lavender to purplish blue or blue, rarely white. Pappus 5–7 mm long. Fruits with the body 4–6 mm long, 1.5–2.0 mm wide, brown to dark brown, often mottled, flattened, with somewhat thickened margins and 4 or 5 nerves or ridges on each face, narrowed or tapered abruptly, beakless or with a short, stout beak much less than 1/2 as long as the body. 2n=34. July–October.

Common throughout the state (eastern U.S. west to South Dakota and Texas; Canada). Banks of streams and rivers, bottomland forests, mesic upland forests, savannas, sand savannas, glades, bases of bluffs, and margins of ponds and lakes; also railroads, roadsides, and open, disturbed areas.

As in L. canadensis, a number of infraspecific variants have been described documenting different leaf morphologies. Of these, f. villosa (Jacq.) Cronquist, with unlobed, toothed leaves, occurs fairly commonly in Missouri. White-flowered plants have been called f. leucantha Fernald.



© 2021 Missouri Botanical Garden - 4344 Shaw Boulevard - Saint Louis, Missouri 63110