Alternanthera philoxeroides

ClassificationDicots
FamilyAmaranthaceae
Family (Traditional)Amaranthaceae
GenusAlternanthera
Species:Alternanthera philoxeroides (Mart.) Griseb.
Common NameAlligatorweed
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Invasive Rank: TN-IPC Established Threat; Natural Area Presence: DRU; Natural Area Presence: LC; Natural Area Presence: LGS; Natural Area Presence: TRG; Duration: Perennial; General Ecology: Mudflat; General Ecology: Terrestrial; Growth Habit: forb; Moisture Requirements: Hydric; Moisture Requirements: Wetland; Region of Origin: North America; Region of Origin: South America; Reproductive Phenology: March; Reproductive Phenology: April; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Reproductive Phenology: October; Leaf Arrangement: opposite; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Type: broadleaf; Leaf Venation: pinnate; Leaflet Margins: entire; Leaflet Number: 0; Base Flower Color: White; Fruit Dehiscence: No; Fruit Type: Utricle; Fruit Wet/Dry: Dry; Ovary Position: Superior; Overall Flower Symmetry: Actinomorphic; Sporangium Arrangement: N/A
C value N/A
StatusNot Native; Invasive; AGCP (OBL), EMP (OBL) (NWPL); TN[SNA] KY[SNA] (State Rank); GNR (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

No synonyms exist for this species.

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: Calloway (KY), Lyon (KY), Marshall (KY), Trigg (KY), Benton (TN), Davidson (TN), Hamilton (TN), Hardin (TN), Henry (TN), Houston (TN), Humphreys (TN), Knox (TN), Marion (TN), Meigs (TN), Perry (TN), Rhea (TN), Rutherford (TN), Shelby (TN), Stewart (TN)

Herbaria represented by specimen data listed below: APSC, BEREA, BOON, EKY, MEM, TENN, UCHT, VDB

Range of years during which specimens were collected: 1970 - 2012

Accession No. (click for full details)
County
State
Coll. Date
Collector &
Collection No.
Herbarium &
Herbarium Name Used
BRIT68390 Benton Tennessee 23 Aug 1978 David H. Webb
1367
VDB
Alternanthera philoxeroides
TENN-V-0090965 Benton Tennessee
TENN
Alternanthera philoxeroides
TENN-V-0090963 Benton Tennessee
TENN
Alternanthera philoxeroides
APSC0030658 Benton Tennessee
APSC
Alternanthera philoxeroides
TENN-V-0090964 Benton Tennessee
TENN
Alternanthera philoxeroides
APSC0030657 Benton Tennessee
APSC
Alternanthera philoxeroides
010645 Calloway Kentucky 05 Jun 2006 Derick B. Poindexter
06-134
BOON
Alternanthera philoxeroides
BEREA001395 Calloway Kentucky
BEREA
Alternanthera philoxeroides
BEREA001397 Calloway Kentucky
BEREA
Alternanthera philoxeroides
BEREA001396 Calloway Kentucky
BEREA
Alternanthera philoxeroides
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Plant Photos

Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw
Alternanthera philoxeroides - Joey Shaw