Zannichellia palustris

ClassificationMonocots
FamilyPotamogetonaceae
Family (Traditional)Potamogetonaceae
GenusZannichellia
Species:Zannichellia palustris L.
Common NameHorned Pondweed
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Natural Area Presence: PCSF; Duration: Perennial; General Ecology: Aquatic; Growth Habit: forb; Moisture Requirements: Hydric; Moisture Requirements: Wetland; Region of Origin: North America; Reproductive Phenology: Febuary; 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: floating; Leaf Arrangement: opposite; Leaf Arrangement: submerged; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: sessile; Leaf Type: grass-like; Leaf Venation: one-veined; Leaf Venation: parallel; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: Basifixed; Base Flower Color: Brown (incl. Maroon); Base Flower Color: Green; Carpel Number/Pistil: 2; Fruit Dehiscence: No; Fruit Type: Achene; Fruit Type: Drupe; Fruit Wet/Dry: Dry; Fruit Wet/Dry: Wet; Hypanthium Present: No; Inflorescence Position: axillary; Inflorescence Types: corymb/cyme/umbel; Ovary Position: Superior; Overall Flower Symmetry: N/A; Ovules per Carpel: 1; Perianth Present: No; Petal Fusion: No; Petal Number: 0; Pistil Complexity: Compound; Pistil Number: 4; Pistil Number: 5; Pistil Number: 6; Pistil Number: 7; Pistil Number: 8; Pistil Number: 9; Placentation Type: Apical; Sepal Fusion: No; Sepal Number: 0; Sexuality: monoclinous; Sexuality: monoecious; Sporangium Arrangement: N/A; Stamen Number: 1; Tepal Fusion: No; Tepal Number: 0
C value 9
StatusNative; AGCP (OBL), EMP (OBL) (NWPL); TN[SNR] KY[S3?] (State Rank); G5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Currently no photos are available for this plant.

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.

  • 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

SynonymFull Citation
Zannichellia major Zannichellia major (Hartm.) Boenn. ex Reichenb.
Zannichellia palustris var. major Zannichellia palustris var. major Hartm.
Zannichellia palustris var. muricata Zannichellia palustris var. muricata
Zannichellia palustris var. stenophylla Zannichellia palustris var. stenophylla Aschers. & Graebn.

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: Bourbon (KY), Calloway (KY), Christian (KY), Fayette (KY), Harrison (KY), Kenton (KY), Lyon (KY), Madison (KY), Marshall (KY), Nicholas (KY), Trigg (KY), Anderson (TN), Bedford (TN), Coffee (TN), DeKalb (TN), Franklin (TN), Hamilton (TN), Hawkins (TN), Hickman (TN), Marion (TN), Montgomery (TN), Obion (TN), Stewart (TN), Sullivan (TN), Trousdale (TN), Wilson (TN)

Herbaria represented by specimen data listed below: APSC, BEREA, EKY, ETSU, HTTU, KNK, MDKY, SWMT, TENN, VDB

Range of years during which specimens were collected: 1937 - 2019

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100169760 Madison Kentucky 05 Jul 1992 Stephen A. Walker
423
EKY
Zannichellia palustris
31234100169802 Coffee Tennessee 01 Jun 1992 Henry R. DeSelm
EKY
Zannichellia palustris
31234100169745 Christian Kentucky 21 May 2000 Ed Hartowicz
EKY
Zannichellia palustris
31234100169752 Nicholas Kentucky 04 Jun 1997 Ronald L. Jones
8176
EKY
Zannichellia palustris
31234100169794 Nicholas Kentucky 03 Oct 1997 James B. Beck
307
EKY
Zannichellia palustris
31234100169778 Madison Kentucky 09 Jun 1993 Gary W. Libby
412
EKY
Zannichellia palustris
MDKY00006763 Kenton Kentucky
MDKY
Zannichellia palustris
MDKY00006766 Harrison Kentucky
MDKY
Zannichellia palustris
MDKY00006765 Bourbon Kentucky
MDKY
Zannichellia palustris
TENN-V-0013753 Calloway Kentucky
TENN
Zannichellia palustris
TENN-V-0013737 Montgomery Tennessee
TENN
Zannichellia palustris
TENN-V-0013741 Trousdale Tennessee
TENN
Zannichellia palustris
TENN-V-0013736 Marion Tennessee
TENN
Zannichellia palustris
TENN-V-0013761 Marion Tennessee
TENN
Zannichellia palustris
TENN-V-0013740 Sullivan Tennessee
TENN
Zannichellia palustris
31234100169737 Christian Kentucky 21 May 2000 Ed Hartowicz
EKY
Zannichellia palustris
BEREA008773 Madison Kentucky
BEREA
Zannichellia palustris
31973000012858 Fayette Kentucky 11 Jun 1987 Haragan, Patricia
1528
KNK
Zannichellia palustris
MDKY00006764 Bourbon Kentucky
MDKY
Zannichellia palustris
TENN-V-0013742 Wilson Tennessee
TENN
Zannichellia palustris
TENN-V-0013754 Marshall Kentucky
TENN
Zannichellia palustris
TENN-V-0013755 Lyon Kentucky
TENN
Zannichellia palustris
TENN-V-0013733 Franklin Tennessee
TENN
Zannichellia palustris
TENN-V-0013752 Trigg Kentucky
TENN
Zannichellia palustris
TENN-V-0013739 Stewart Tennessee
TENN
Zannichellia palustris
TENN-V-0013756 Lyon Kentucky
TENN
Zannichellia palustris
TENN-V-0013735 Hamilton Tennessee
TENN
Zannichellia palustris
APSC0031593 Trigg Kentucky
APSC
Zannichellia palustris
APSC0031598 Marshall Kentucky 25 May 1988 David H. Webb
APSC
Zannichellia palustris
BRIT181024 Franklin Tennessee 07 Aug 1986 David H. Webb
5239
VDB
Zannichellia palustris
TENN-V-0013738 Obion Tennessee
TENN
Zannichellia palustris
TENN-V-0013732 Anderson Tennessee
TENN
Zannichellia palustris
TENN-V-0013734 Franklin Tennessee
TENN
Zannichellia palustris
APSC0031595 Stewart Tennessee
APSC
Zannichellia palustris
APSC0031599 Montgomery Tennessee 11 Sep 1949 Alfred Clebsch
APSC
Zannichellia palustris
APSC0031592 Lyon Kentucky
APSC
Zannichellia palustris
APSC0053183 Bedford Tennessee
APSC
Zannichellia palustris
APSC0031597 Hamilton Tennessee
APSC
Zannichellia palustris
APSC0031594 Stewart Tennessee
APSC
Zannichellia palustris
HTTU032914 DeKalb Tennessee
HTTU
Zannichellia palustris
SWMT00432 Tennessee 17 May 1939
SWMT
Zannichellia palustris
ETSU027012 Hawkins Tennessee 18 Oct 2019 Frosty Levy, Elaine Walker
191168
ETSU
Zannichellia palustris
BRIT181025 Anderson Tennessee 20 Oct 1981 David H. Webb
4426
VDB
Zannichellia palustris
BRIT181021 Sullivan Tennessee 27 Sep 1979 David H. Webb
2416
VDB
Zannichellia palustris
BRIT181023 Hickman Tennessee 28 Jul 1981 R. Kral
67615
VDB
Zannichellia palustris
BRIT181022 Marion Tennessee 01 Aug 1985 David H. Webb
5137
VDB
Zannichellia palustris
SWMT00431 Tennessee 15 May 1937 Brevtspraak
SWMT
Zannichellia palustris
N/A Hawkins Tennessee 25 Aug 2019 Frosty Levy, Elaine Walker
ETSU
Zannichellia palustris
ETSU026636 Hawkins Tennessee 25 Aug 2019 Frosty Levy, Elaine Walker
19791
ETSU
Zannichellia palustris
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