Lactuca canadensis

ClassificationDicots
FamilyAsteraceae
Family (Traditional)Asteraceae
GenusLactuca
Species:Lactuca canadensis L.
Common NameCanada Lettuce; Wild Lettuce
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: Yes; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Natural Area Presence: BE; Natural Area Presence: BFM; Natural Area Presence: DRU; Natural Area Presence: FCFSP; Natural Area Presence: GILES; Natural Area Presence: GRSM; Natural Area Presence: LC; Natural Area Presence: LCW; Natural Area Presence: LGS; Natural Area Presence: LRC; Natural Area Presence: PK; Natural Area Presence: RCSP; Natural Area Presence: SGSNA; Natural Area Presence: SM; Natural Area Presence: TRG; Natural Area Presence: UCR; Duration: Biennial; General Ecology: Terrestrial; Growth Habit: forb; Moisture Requirements: Dry-mesic; Moisture Requirements: Mesic; Region of Origin: North America; Reproductive Phenology: June; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Reproductive Phenology: October; Leaf Arrangement: alternate; Leaf Complexity: simple; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: sessile; Leaf Type: broadleaf; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: Basifixed; Base Flower Color: Blue; Base Flower Color: Yellow; Carpel Number/Pistil: 1; Fruit Complexity: Simple; Fruit Dehiscence: No; Fruit Type: Cypsela; Fruit Wet/Dry: Dry; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: corymb/cyme/umbel; Inflorescence Types: head; Ovary Position: Inferior; Overall Flower Symmetry: Zygomorphic; Ovules per Carpel: 1; Perianth Present: Yes; Petal Fusion: Yes; Petal Number: 5; Pistil Complexity: Simple; Pistil Number: 1; Placentation Type: Basal; Sepal Fusion: N/A; Sepal Number: N/A; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 5; Tepal Number: N/A
C value 3
StatusNative; AGCP (FACU), EMP (FACU) (NWPL); TN[SNR] KY[S4S5] (State Rank); G5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

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  • State Boundaries
  • Counties
  • Counties - Species Present
Ecoregions
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim

Synonyms (8)

SynonymFull Citation
Lactuca canadensis var. canadensis Lactuca canadensis var. canadensis
Lactuca canadensis var. integrifolia Lactuca canadensis var. integrifolia Farw.
Lactuca canadensis var. latifolia Lactuca canadensis var. latifolia Kuntze
Lactuca canadensis var. longifolia Lactuca canadensis var. longifolia (Michx.) Farw.
Lactuca canadensis var. obovata Lactuca canadensis var. obovata Wiegand
Lactuca sagittifolia Lactuca sagittifolia Ell.
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Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Anderson (KY), Ballard (KY), Barren (KY), Bath (KY), Bell (KY), Breathitt (KY), Breckinridge (KY), Bullitt (KY), Caldwell (KY), Calloway (KY), Campbell (KY), Carter (KY), Christian (KY), Clark (KY), Clinton (KY), Edmonson (KY), Elliott (KY), Estill (KY), Franklin (KY), Gallatin (KY), Garrard (KY), Hardin (KY), Harlan (KY), Hopkins (KY), Jackson (KY), Jefferson (KY), Kenton (KY), Larue (KY), Laurel (KY), Letcher (KY), Livingston (KY), Lyon (KY), McCracken (KY), McCreary (KY), McLean (KY), Madison (KY), Meade (KY), Monroe (KY), Montgomery (KY), Muhlenberg (KY), Nelson (KY), Ohio (KY), Oldham (KY), Owen (KY), Pendleton (KY), Powell (KY), Pulaski (KY), Rockcastle (KY), Rowan (KY), Trigg (KY), Warren (KY), Whitley (KY), Wolfe (KY), Anderson (TN), Benton (TN), Bledsoe (TN), Blount (TN), Bradley (TN), Campbell (TN), Cannon (TN), Carter (TN), Cheatham (TN), Claiborne (TN), Cocke (TN), Coffee (TN), Cumberland (TN), Davidson (TN), DeKalb (TN), Franklin (TN), Giles (TN), Greene (TN), Grundy (TN), Hamilton (TN), Hawkins (TN), Haywood (TN), Henry (TN), Hickman (TN), Houston (TN), Humphreys (TN), Jackson (TN), Johnson (TN), Knox (TN), Lauderdale (TN), McMinn (TN), Macon (TN), Marion (TN), Maury (TN), Meigs (TN), Montgomery (TN), Morgan (TN), Overton (TN), Polk (TN), Putnam (TN), Roane (TN), Robertson (TN), Rutherford (TN), Scott (TN), Sevier (TN), Shelby (TN), Stewart (TN), Sullivan (TN), Tipton (TN), Unicoi (TN), Van Buren (TN), Washington (TN), Weakley (TN), White (TN), Williamson (TN)

Herbaria represented by specimen data listed below: BEREA, TENN, MTSU, UOS, APSC, EKY, HTTU, KNK, UCHT, MEM, SWMT, VDB, ETSU

Range of years during which specimens were collected: 1897 - 2019

Accession No. (click for full details)
County
State
Coll. Date
Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100266681 Anderson Kentucky 26 Jul 1978 William S. Bryant
127
EKY
Lactuca canadensis
31234100266673 Anderson Kentucky 08 Aug 1978 William S. Bryant
80
EKY
Lactuca canadensis
TENN-V-0239088 Anderson Tennessee
TENN
Lactuca canadensis
MEM006355 Ballard Kentucky 24 Aug 1973 Raymond Athey
2512
MEM
Lactuca canadensis
APSC0091410 Ballard Kentucky
APSC
Lactuca canadensis
APSC0058680 Barren Kentucky 30 Jun 1979 G.P. Johnson
APSC
Lactuca canadensis
APSC0058754 Barren Kentucky 30 Jun 1979 G.P. Johnson
APSC
Lactuca canadensis
31234100266699 Barren Kentucky 13 Jun 1993 Charles J. Lapham
101
EKY
Lactuca canadensis
31234100266707 Bath Kentucky 27 Jul 1984 Julian Campbell
703
EKY
Lactuca canadensis
31234100389665 Bell Kentucky 12 Aug 1989 Ralph L. Thompson
89-1334
EKY
Lactuca canadensis
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Plant Photos

Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Dwayne Estes
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Joey Shaw
Lactuca canadensis - Milo Pyne
Lactuca canadensis - Milo Pyne
Lactuca canadensis - Milo Pyne
Lactuca canadensis - Milo Pyne