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Lycopus americanus Muhl. ex W. Bartram
AMERICAN WATER HOREHOUND
Life   Plantae   Dicotyledoneae   Lamiaceae   Lycopus

Lycopus americanus, Water Horehound
© Copyright Sheryl Pollock 2011 · 9
Lycopus americanus, Water Horehound

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Lycopus americanus, Water Horehound
© Copyright Sheryl Pollock 2011 · 8
Lycopus americanus, Water Horehound

Associates · map
FamilyScientific name @ source (records)
Aphididae  Tiliphagus lycoposugus @ NCSU (5)
Physodermataceae  Physoderma lycopi @ BPI (2)
Pucciniaceae  Puccinia angustata @ 045738A (1); BPI (17); 045738B (1)
Synchytriaceae  Synchytrium cellulare @ BPI (1)

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Following modified from Delaware Wildflowers
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Delaware Wildflowers  •  Scientific names

Lycopus americanus Muhl. ex W. Bart. American Bugleweed
Lamiaceae — Mint family
Native
Lycopus americanus
Cape Henlopen State Park
August 2003

Search Google Delaware USDA

Photos copyright David G. Smith

Delaware Wildflowers main page

Following modified from MissouriPlants.com
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Lycopus americanus Muhl. ex W.P.C. Barton

American Bugleweed

Lycopus americanus plant

Family - Lamiaceae

Habit - Perennial forb with elongate rhizomes, lacking tubers.

Stem - Ascending to erect, to 90 cm, 4-angled, glabrous to densely pubescent with short, appressed and/or long, spreading hairs.

Lycopus_americanus_stem.jpg Stem.

Leaves - Opposite, short-petiolate, the petioles wings. Blades 1.5-15.0 cm long, highly variable, narrowly ovate to narrowly lanceolate to nearly linear in outline, those of at least the lower leaves deeply pinnately lobed (the lobes entire, few toothed, or occasionally pinnately few-lobed), those of the upper and sometimes also median leaves often merely coarsely few-toothed, tapered concavely at the base, tapered to a sharply pointed tip, the upper surface glabrous, the undersurface glabrous or sparsely short-hairy along the veins.

Lycopus_americanus_leaf2.jpg Leaf abaxial.

Lycopus_americanus_leaf2a.jpg

Inflorescences - Dense axillary clusters, with numerous flowers per node, these sessile or nearly so. Bractlets 1-3 mm long, narrowly lanceolate to elliptic-lanceolate.

Lycopus_americanus_inflorescences.jpg Inflorescences.

Flowers - Calyces nearly actinomorphic, 2.0-3.2 mm long, 5-lobed to about the midpoint, the lobes more or less spreading, narrowly triangular, tapered to a sharply pointed tip. Corollas 2.5-3.5 mm long, 4-lobed, the upper lobe slightly broader than the others and shallowly notched, the lateral and lower lobes spreading. Stamens slightly exserted.

Lycopus_americanus_calyces.jpg Calyces.

Lycopus_americanus_flowers.jpg Flowers.

Lycopus_americanus_flowers2.jpg Flowers2.

Fruits - Nutlets 1.0-1.4 mm long, shorter than the calyx tube at maturity, more or less oblique at the tip, the corky band entire or slightly undulate, lacking teeth or tubercles.

Flowering - June - October.

Habitat - Bottomland forests, sloughs, streambanks, pond margins, ditches, fields, open wet areas.

Origin - Native to the U.S.

Lookalikes - Other species of Lycopus , also plants in the genus Mentha and Spermacoce glabra .

Other info. - This is the most common bugleweed in Missouri, being found in nearly every county in the state. It is also found in every state in the continental U.S. except Nevada, although it is less common in southern and Plains states.

The bugleweeds are easy to recognize generically, but can be very difficult to identify to the species level. They are differentiated from the culinary mints ( Mentha sp.) by having sessile, rather than stalked, flowers. They also lack any trace of minty aroma. Lycopus americanus is usually recognized by having deeply lobed lower leaves, but this character is extremely variable and not very reliable. Other clues are its nutlets, which are shorter than the calyx enclosing them, and corollas with 4 lobes. The genus is taxonomically problematic and could use further study.

Photographs taken at Klondike County Park, St. Charles County, MO, 8-3-2014, and at Big Cane Conservation Area, Butler County, MO, 9-7-2019 (SRTurner).



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You are here: Home / Plant Profile

Lycopus americanus Muhl. ex W.P.C. Barton
American water horehound

Image of Lycopus americanus

General Information
Symbol: LYAM
Group: Dicot
Family: Lamiaceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : CAN   N
L48   N
Characteristics
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

click on a thumbnail to view an image, or see all the Lycopus thumbnails at the Plants Gallery

Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species . Midwest National Technical Center, Lincoln. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

©Thomas G. Barnes. Barnes, T.G., and S.W. Francis. 2004. Wildflowers and ferns of Kentucky . University Press of Kentucky. Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, MD. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 148. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. Provided by NRCS National Wetland Team . Usage Requirements .

slideshow

Synonyms

Symbol Scientific Name
LYAML Lycopus americanus Muhl. ex W.P.C. Barton var. longii Benner
LYAMS Lycopus americanus Muhl. ex W.P.C. Barton var. scabrifolius Fernald
LYSI3 Lycopus sinuatus Elliott

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Asteridae
Order Lamiales
Family Lamiaceae ⁄ Labiatae – Mint family
Genus Lycopus L. – waterhorehound
Species Lycopus americanus Muhl. ex W.P.C. Barton – American water horehound

Subordinate Taxa

This plant has no children

Legal Status

U.S. Weed Information
Lycopus americanus American bugleweed American water horehound water horehound This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S.
NE&GP Stubbendieck, J., G.Y. Friisoe,and M.R. Bolick. 1994. Weeds of Nebraska and the Great Plains . Nebraska Department of Agriculture, Bureau of Plant Industry. Lincoln, Nebraska.

Wetland Status

Interpreting Wetland Status

North America
Alaska OBL
Arid West OBL
Atlantic and Gulf Coastal Plain OBL
Eastern Mountains and Piedmont OBL
Great Plains OBL
Midwest OBL
Northcentral & Northeast OBL
Western Mountains, Valleys, and Coast OBL

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (LYAM)
Integrated Taxonomic Information System (LYAM)
Integrated Taxonomic Information System (LYAML)
Integrated Taxonomic Information System (LYAMS)
Integrated Taxonomic Information System (LYSI3)
Jepson Interchange (University of California - Berkeley) (LYAM)
Lady Bird Johnson Wildflower Center Native Plant Information Network (LYAM)
Native American Ethnobotany (University of Michigan - Dearborn) (LYAM)
USF Atlas of Florida Vascular Plants (LYAM)
University of Tennessee Herbarium (Distribution) (LYAM)
University of Wisconsin - Stevens Point Freckmann Herbarium (LYAM)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Lycopus+americanus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Lycopus+americanus&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 16
Query: SELECT * FROM img WHERE ready=1 and taxon like "Lycopus americanus%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0107 1045 [detail]
© 2007 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0107 1046 [detail]
© 2007 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0107 1047 [detail]
© 2007 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0107 1048 [detail]
© 2007 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0408 1978 [detail]
© 2008 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0408 1979 [detail]
© 2008 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0408 1980 [detail]
© 2008 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0510 2722 [detail]
© 2010 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0510 2723 [detail]
© 2010 Louis-M. Landry

Lycopus americanus
Lycopus americanus
ID: 0000 0000 0510 2724 [detail]
© 2010 Louis-M. Landry

Lycopus americanus
Lycopus americanus
American Bugleweed
ID: 0000 1111 1234 4679 [detail]
© 2016 Keir Morse

Lycopus americanus
Lycopus americanus
American Bugleweed
ID: 0000 1111 1234 4680 [detail]
© 2016 Keir Morse

Lycopus americanus
Lycopus americanus
American Bugleweed
ID: 0000 1111 1234 4681 [detail]
© 2016 Keir Morse

Lycopus americanus
Lycopus americanus
American Bugleweed
ID: 0000 1111 1234 4682 [detail]
© 2016 Keir Morse

Lycopus americanus
Lycopus americanus
American Bugleweed
ID: 0000 1111 1234 4683 [detail]
© 2016 Keir Morse

Lycopus americanus
Lycopus americanus
American Bugleweed
(shown with Willow-alder scrub )
ID: 0000 0000 0817 1764 [detail]
© 2017 Christopher Bronny

Using these photos: A variety of organizations and individuals have contributed photographs to CalPhotos. Please follow the usage guidelines provided with each image. Use and copyright information, as well as other details about the photo such as the date and the location, are available by clicking on the [detail] link under the thumbnail. See also: Using the Photos in CalPhotos .   


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