Podostemum ceratophyllum

Family:PODOSTEMACEAE
Species:Podostemum ceratophyllum Michaux
Common Name:Horn Leaf Riverweed; Threadfoot
Habitat:**
Associated Ecological Communities:**
Growth Habit:**
Duration:**
Category:**
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 Michaux - Horn Leaf Riverweed; Threadfoot

Citation

Citation **
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, Macon, Marion, Randolph, Shelby, Talladega, Tallapoosa, Tuscaloosa

Counties represented by specimen data listed below:

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

Range of years during which specimens were collected: 1884 - 2002

Barcode / Accession No. County Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
Image
UWAL0014867 Coosa 12 Jul 2013 Diamond, Alvin R.
24367
UWAL
Podostemum ceratophyllum Michaux
JSU139037 Jackson 30 Jun 1996 D. D. Spaulding
9028
JSU
Podostemum ceratophyllum Michaux
UWAL0012119 Tallapoosa 17 Jun 2013 Davenport, L.J.
5460
UWAL
Podostemum ceratophyllum Michaux
SAMF0000941 Coosa 21 Jun 2005 Davenport, L. J.
3251
SAMF
Podostemum ceratophyllum Michaux
TROY000042166 Conecuh 04 Jun 2011 Alvin R. Diamond
22175
TROY
Podostemum ceratophyllum Michaux
UNA00018723 Lee 25 Jun 1959 John L. Carothers
s.n.
UNA
Podostemum ceratophyllum Michx.
UNA00018713 Lauderdale 31 Jul 1978 Robert R. Haynes
6784
UNA
Podostemum ceratophyllum Michx.
UNA00018719 DeKalb 03 Jul 1980 Russell A. Meigs
930
UNA
Podostemum ceratophyllum Michx.
JSU142079 Clay 12 Jul 1993 J. M. Ballard
2946
JSU
Podostemum ceratophyllum Michaux
UWAL0012207 Marion 17 Jun 2013 Keener, Brian R.
7907.1
UWAL
Podostemum ceratophyllum Michaux
TROY000046135 Marion 17 Jun 2013 Brian R. Keener
7907a
TROY
Podostemum ceratophyllum Michaux
SAMF0000940 Shelby 28 Jun 2005 Davenport, L. J.
3257
SAMF
Podostemum ceratophyllum Michaux
SAMF0000947 Lee 22 May 1991 Davenport, L. J.
2760
SAMF
Podostemum ceratophyllum Michaux
AUA_ACC050900 Conecuh 7 AUG 1991 DIAMOND, JR., ALVIN R.
7616
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
UNA00047410 Dale 13 Jun 1997 John R. MacDonald
10668
UNA
Podostemum ceratophyllum Michx.
UNA00018718 DeKalb 07 Jul 1978 Robert R. Haynes
6587
UNA
Podostemum ceratophyllum Michx.
UNA00018722 DeKalb 03 Jul 1980 Russell A. Meigs
930
UNA
Podostemum ceratophyllum Michx.
TROY000039534 Elmore 17 Oct 2011 Robert Pullen
311
TROY
Podostemum ceratophyllum Michaux
UNA00018735 Lauderdale 02 Jul 1964 T. F. Hall
s.n.
UNA
Podostemum ceratophyllum Michx.
SAMF0000942 Coosa 21 Jun 2005 Davenport, L. J.
3248
SAMF
Podostemum ceratophyllum Michaux
UNA00018720 Lee 04 Apr 1897 Baker
s.n.
UNA
Podostemum ceratophyllum Michx.
UNA00018716 Lee 12 Jun 1979 John H. Wiersema
831
UNA
Podostemum ceratophyllum Michx.
UNA00018709 Clay 02 Jul 1979 Robert R. Haynes
7372
UNA
Podostemum ceratophyllum Michx.
UNA00018712 DeKalb 03 Jul 1980 Russell A. Meigs
930
UNA
Podostemum ceratophyllum Michx.
SAMF0001661 Tallapoosa 17 Jun 2013 Davenport, L. J.
5460
SAMF
Podostemum ceratophyllum Michaux
UNA00059418 Cleburne 02 Jun 2002 D. D. Spaulding
11334
UNA
Podostemum ceratophyllum Michx.
SAMF0000944 Coosa 31 May 1989 Davenport, L. J.
2671
SAMF
Podostemum ceratophyllum Michaux
JSU142078 Clay 19 Oct 1996 J. M. Ballard
6993
JSU
Podostemum ceratophyllum Michaux
TROY000007780 Covington 17 Jun 2002 Alvin R. Diamond
13343
TROY
Podostemum ceratophyllum Michaux
UNA00018710 Cherokee 01 Jul 1979 Robert R. Haynes
7329
UNA
Podostemum ceratophyllum Michx.
UNA00018715 Tallapoosa 21 Jun 1980 Robert R. Haynes
7879
UNA
Podostemum ceratophyllum Michx.
UNA00057001 Shelby 09 May 1987 Frank D. Bowers
15198
UNA
Podostemum ceratophyllum Michx.
UWAL0036010 Blount 10 Nov 2012 Anderson, Kelly
0101
UWAL
Podostemum ceratophyllum Michx.
AUA_ACC050902 Covington 7 AUG 1991 DIAMOND, JR., ALVIN R.
7618
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
JSU142080 Lee 29 Jun 1978 R. Kral
62212
JSU
Podostemum ceratophyllum Michaux
UNA00018717 Cherokee 06 Jul 1978 John H. Wiersema
376
UNA
Podostemum ceratophyllum Michx.
UNA00018726 Bibb 13 Jul 1979 Robert R. Haynes
7462
UNA
Podostemum ceratophyllum Michx.
UNA00018728 Coosa 20 Mar 1987 Robert R. Haynes
8797
UNA
Podostemum ceratophyllum Michx.
TROY000022106 Cleburne 02 Jun 2002 Daniel D. Spaulding
11334
TROY
Podostemum ceratophyllum Michaux
UWAL0033713 Clay 22 Jun 2016 Keener, Brian R.
9691
UWAL
Podostemum ceratophyllum Michaux
UNA00054084 Blount 26 Jul 1997 Brian R. Keener
271
UNA
Podostemum ceratophyllum Michx.
AUA_ACC057152 Conecuh 18 JUN 1996 DIAMOND, JR., ALVIN R.
10334
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
SAMF0000938 Blount 30 Jul 2009 Davenport, L. J.
3991
SAMF
Podostemum ceratophyllum Michaux
SAMF0000948 Bibb 27 Jun 1988 Davenport, L. J.
2571
SAMF
Podostemum ceratophyllum Michaux
AUA_ACC010830 Macon 30 JUN 1959 FARMER, JOE A.
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
UNA00018721 Tuscaloosa 17 Jun 1979 L. J. Davenport
1204
UNA
Podostemum ceratophyllum Michx.
UNA00053326 Tallapoosa 10 Jun 1999 Robert R. Haynes
10000
UNA
Podostemum ceratophyllum Michx.
UWAL0005704 Blount 30 Jul 2009 Davenport, L.J.
3991
UWAL
Podostemum ceratophyllum Michaux
SAMF0000939 Blount 04 Aug 2009 Davenport, L. J.
3993
SAMF
Podostemum ceratophyllum Michaux
AUA_ACC010852 Lee 27 JUL 1959 AKEDIN, ZAYNUL
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
UNA00018724 Blount 14 Jun 1884 Charles Mohr
s.n.
UNA
Podostemum ceratophyllum Michx.
SAMF0000943 Talladega 08 Jun 2005 Davenport, L. J.
3231
SAMF
Podostemum ceratophyllum Michaux
SAMF0000945 Tallapoosa 30 May 1989 Davenport, L. J.
2667
SAMF
Podostemum ceratophyllum Michaux
TROY000007781 Dale 13 Jun 2002 Alvin R. Diamond
13301
TROY
Podostemum ceratophyllum Michaux
UNA00018725 Lee 27 Jul 1959 Mario M. Pamatmat
s.n.
UNA
Podostemum ceratophyllum Michx.
UNA00018727 Lee 20 Jun 1980 Robert R. Haynes
7858
UNA
Podostemum ceratophyllum Michx.
AUA_ACC005641 Tallapoosa 8 MAR 1958 CLAWSON, STERLING G.
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
SAMF0000946 Bibb 18 Jun 1988 Davenport, L. J.
2570
SAMF
Podostemum ceratophyllum Michaux
UNA00016712 Marion 26 Mar 1987 Frank D. Bowers
13064
UNA
Podostemum ceratophyllum Michx.
SAMF0006588 Clay 22 Jun 2016 Davenport, L.J.
6416
SAMF
Podostemum ceratophyllum Michaux
TROY000037573 Coosa 12 Jul 2013 Alvin R. Diamond
24367
TROY
Podostemum ceratophyllum Michaux
AUA_ACC059110 Dale 24 JUL 1998 DIAMOND, JR., ALVIN R.
11353
AUA
PODOSTEMUM CERATOPHYLLUM MICHAUX
TROY000007779 Coffee 06 Sep 1999 Brian H. Martin
185
TROY
Podostemum ceratophyllum Michaux
UNA00018714 Randolph 01 Jul 1979 Robert R. Haynes
7354
UNA
Podostemum ceratophyllum Michx.
UNA00018711 Coosa 21 Jun 1980 Robert R. Haynes
7904
UNA
Podostemum ceratophyllum Michx.
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