Pilularia americana

ClassificationPteridophytes
FamilyMarsileaceae
Family (Traditional)Marsileaceae
GenusPilularia
SpeciesPilularia americana A. Braun
Common NameAmerican pillwort
Growth Habitfern
Plant NotesLeaf Persistance: Deciduous; Habit: fern; Woody/Herbaceous: herbaceous; Terrestrial/Aquatic: Aquatic; Mud;
Leaf Arrangement: Basal; Simple/Compound: Simple;
Hypanthium: No; Perianth Absent: No; Fruit Color: ;
*Average C-Value: 8.5
C value 8
StatusNative; AGCP (OBL), EMP (OBL) (NWPL); TN[S1S2] (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.

  • 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: Blount (TN), Henderson (TN), Polk (TN), Van Buren (TN)

Herbaria represented by specimen data listed below: TENN, UOS, VDB

Range of years during which specimens were collected: 1979 - 2002

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
TENN-V-0011694 Henderson Tennessee
TENN
Pilularia americana
TENN-V-0011693 Henderson Tennessee
TENN
Pilularia americana
TENN-V-0011697 Polk Tennessee
TENN
Pilularia americana
TENN-V-0011696 Polk Tennessee
TENN
Pilularia americana
BRIT191585 Blount Tennessee 23 Sep 1998 B. E. Wofford
98-67
VDB
Pilularia americana
TENN-V-0011692 Blount Tennessee
TENN
Pilularia americana
TENN-V-0011698 Van Buren Tennessee
TENN
Pilularia americana
TENN-V-0011695 Henderson Tennessee
TENN
Pilularia americana
UOS08617 Van Buren Tennessee 15 Aug 2002 Chris A. Fleming
UOS
Pilularia americana
BRIT191590 Polk Tennessee 17 Oct 1983 Frank Fusiak
82-110
VDB
Pilularia americana
BRIT191589 Henderson Tennessee 20 Jun 1979 David H. Webb
2001
VDB
Pilularia americana
BRIT191586 Henderson Tennessee 27 Jul 1979 Buddy Price
2173
VDB
Pilularia americana
BRIT191588 Henderson Tennessee 08 Jun 1981 David H. Webb
4024
VDB
Pilularia americana
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Plant Photos

Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw
Pilularia americana - Theo Witsell
Pilularia americana - Theo Witsell
Pilularia americana - Theo Witsell
Pilularia americana - Theo Witsell
Pilularia americana - Joey Shaw
Pilularia americana - Joey Shaw