Podostemum ceratophyllum

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Distribution Map: Based on vouchered plant specimens only. View county names by placing the mouse cursor over a particular county.

Species Distribution Map
Family:PODOSTEMACEAE
Species:Podostemum ceratophyllum Michx.
Common Name:Horn Leaf Riverweed; Threadfoot
Habitat:**
Associated Ecological Communities:**
Growth Habit:Herb
Duration:Perennial
Category:Vascular
USDA Symbol:**
Plant Notes:Horn Leaf Riverweed is a native perennial in the Riverweed family (Podostemaceae). Horn Leaf Riverweed is a submerged aquatic plant growing attached to rocks in riffles, waterfalls, and other areas of shallow, swift flowing water. It can be found throughout Alabama where suitable habitat occurs. Horn Leaf Riverweed grows tightly attached to rocks by the means of haptera (fleshy disc-like outgrowths) that are produced along its roots. Leaves are olive green in color and repeatedly forked and divided into linear segments. They are attached alternately along the stem. Flowers are produced when plants are exposed by low water levels. The flowers occur in groups of 1-12. The tepals (sepals and petals) are small and scale-like, making them very inconspicuous. Each flower consists of one ovary and two stamens. The fruit is a capsule. Horn Leaf Riverweed is an unusual flowering vascular plant that more closely resembles an algae or moss. It often forms extensive mats in suitable habitat. It has been associated with extremely high secondary production of benthic macroinvertebrates, and is an important component in stream productivity. Horn Leaf Riverweed also provides shelter for many species.--A. Diamond
Taxonomic Notes:**
Status:Native
References:**
Specimen: View specimen details in the Alabama Herbarium Consortium Specimen Database

** Not applicable or data not available.

Classification

FamilyPODOSTEMACEAE - Riverweed family
Genus Podostemum
Species Podostemum ceratophyllum Michx. - Horn Leaf Riverweed; Threadfoot

Citation

Citation Podostemum ceratophyllum Michaux, Fl. Bor.-Amer. 2: 165, pl. 44 [as "Podostemon"]. 1803.
Basionym: **
Type: **

** Not applicable or data not available.

Synonyms

SynonymFull CitationBasionymType
Podostemum abrotanoides    

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; choose a county or herbaria to filter the specimen data.

Counties included on distribution map: Bibb, Blount, Cherokee, Clay, Cleburne, Coffee, Conecuh, Coosa, Covington, Dale, DeKalb, Elmore, Jackson, Lauderdale, Lee, Limestone, Macon, Marion, Marshall, Randolph, Shelby, Talladega, Tallapoosa, Tuscaloosa

Counties represented by specimen data listed below:

Herbaria represented by specimen data listed below: ALNHS, AUA, JSU, SAMF, TROY, UNA, UWAL

Range of years during which specimens were collected: 1884 - 2019

Barcode / Accession No.
County
Coll. Date
Collector &
Collection No.
Herbarium &
Herbarium Name Used
Image
UNA00018726 Bibb 13 Jul 1979 Haynes, Robert R.
7462		 UNA
Podostemum ceratophyllum Michx.
SAMF0000946 Bibb 18 Jun 1988 Davenport, Lawrence J.
2570		 SAMF
Podostemum ceratophyllum Michaux
SAMF0000948 Bibb 27 Jun 1988 Davenport, Lawrence J.
2571		 SAMF
Podostemum ceratophyllum Michaux
UWAL0056480 Bibb 11 Jun 2019 Keener, Brian R.
11358		 UWAL
Podostemum ceratophyllum Michx.
UNA00018724 Blount 14 Jun 1884 Mohr, Charles
s.n.		 UNA
Podostemum ceratophyllum Michx.
UNA00054084 Blount 26 Jul 1997 Keener, Brian R.
271		 UNA
Podostemum ceratophyllum Michx.
UWAL0005704 Blount 30 Jul 2009 Davenport, L.J.
3991		 UWAL
Podostemum ceratophyllum Michaux
SAMF0000938 Blount 30 Jul 2009 Davenport, Lawrence J.
3991		 SAMF
Podostemum ceratophyllum Michaux
SAMF0000939 Blount 04 Aug 2009 Davenport, Lawrence J.
3993		 SAMF
Podostemum ceratophyllum Michaux
UWAL0036010 Blount 10 Nov 2012 Anderson, Kelly
101		 UWAL
Podostemum ceratophyllum Michx.
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