Pilularia americana

Classification	Pteridophytes
Family	Marsileaceae
Family (Traditional)	Marsileaceae
Genus	Pilularia
Species:	Pilularia americana A. Braun
Common Name	American Pillwort
Growth Habit	fern
Plant Notes	**
Characteristics	Armaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Natural Area Presence: FCFSP; Duration: Perennial; General Ecology: Aquatic; General Ecology: Mudflat; Growth Habit: fern; Moisture Requirements: Hydric; Moisture Requirements: Wetland; Region of Origin: North America; Reproductive Phenology: April; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Reproductive Phenology: October; Leaf Arrangement: basal; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: petiolate; Leaf Rank: N/A; Leaf Type: grass-like; Leaf Venation: one-veined; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: N/A; Carpel Number/Pistil: N/A; Fruit Complexity: N/A; Fruit Type: N/A; Fruit Wet/Dry: N/A; Hypanthium Present: No; Inflorescence Position: N/A; Inflorescence Types: N/A; Ovary Position: N/A; Overall Flower Symmetry: N/A; Ovules per Carpel: N/A; Perianth Present: No; Petal Fusion: N/A; Petal Number: N/A; Pistil Complexity: N/A; Pistil Number: N/A; Placentation Type: N/A; Sepal Fusion: N/A; Sepal Number: N/A; Sexuality: N/A; Sporangium Arrangement: upright panicle; Stamen Number: N/A; Tepal Number: N/A
C value	7
Status	Native; 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.

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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

Interior River Valleys and Hills
- Shawnee / Caseyville Hills
Mississippi Alluvial Plain
Mississippi Valley Loess Plains
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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
BRIT191589	Henderson	Tennessee	20 Jun 1979	David H. Webb 2001	VDB Pilularia americana
TENN-V-0011695	Henderson	Tennessee			TENN Pilularia americana
TENN-V-0011696	Polk	Tennessee			TENN Pilularia americana
TENN-V-0011692	Blount	Tennessee			TENN Pilularia americana
TENN-V-0011693	Henderson	Tennessee			TENN Pilularia americana
UOS08617	Van Buren	Tennessee	15 Aug 2002	Chris A. Fleming	UOS 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
TENN-V-0011698	Van Buren	Tennessee			TENN Pilularia americana
TENN-V-0011694	Henderson	Tennessee			TENN Pilularia americana
TENN-V-0011697	Polk	Tennessee			TENN Pilularia americana
BRIT191590	Polk	Tennessee	17 Oct 1983	Frank Fusiak 82-110	VDB Pilularia americana
BRIT191585	Blount	Tennessee	23 Sep 1998	B. E. Wofford 98-67	VDB Pilularia americana

View a List of All Ecological Communities

Pilularia americana

Related Links

Species Distribution Map

Ecoregions

Synonyms

Specimens and Distribution

Plant Photos