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Justicia americana (L.) Vahl
AMERICAN WATER-WILLOW
Life   Plantae   Dicotyledoneae   Acanthaceae   Justicia

Justicia americana, leaf and flower
© Kay Yatskievych, 2003 · 10
Justicia americana, leaf and flower

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Justicia americana, American Water-willow
© Copyright Sheryl Pollock 2011 · 8
Justicia americana, American Water-willow
Justicia americana, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Justicia americana, leaf - basal or on lower stem

Justicia americana, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Justicia americana, leaf - basal or on lower stem
Justicia americana, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Justicia americana, stem - showing leaf bases

Justicia americana, leaf - margin of upper + lower surface
© Copyright Steve Baskauf, 2002-2011 · 4
Justicia americana, leaf - margin of upper + lower surface
Justicia americana, whole plant - juvenile
© Copyright Steve Baskauf, 2002-2011 · 4
Justicia americana, whole plant - juvenile

Justicia americana, habitat
© Kay Yatskievych, 2003 · 1
Justicia americana, habitat
Justicia americana
Ross Bowron · 0
Justicia americana
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Following modified from MissouriPlants.com
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Justicia americana (L.) Vahl

Water Willow

Justicia americana plant

Family - Acanthaceae

Stems - To +40cm tall, herbaceous, rooting at nodes below, from creeping rhizomes, glabrous, with seven distinct vascular bundles in a ring and one bundle in center of that ring when stem is cut in cross section.

Leaves - Opposite, sessile to very short-petiolate, linear to linear-elliptic or linear-lanceolate, to +10cm long, 2.5cm broad, glabrous, entire to shallow crenate.

Justicia americana leaf

Inflorescence - Axillary capitate pedunculate spikes to +/-3cm long. Peduncles to +10cm long. Flowers opposite.

Justicia americana inflorescence

Flowers - Corolla bilabiate, white to pale lavender or pale violet. Corolla tube 4-5mm long. Upper lip reflexed, bluish to purplish 6-7mm long, 5mm broad, notched at apex. Lower lip 3-lobed. Larger central lobe with purple mottling, 1cm long, 5mm broad. Lateral lobes spreading, 8mm long, 3mm broad, typically white. Stamens 2, adnate near apex of corolla tube, slightly exserted from upper lip. Filaments white, 5mm long, glabrous. Anthers with distinct sacs, purplish to brownish. Ovary green, glabrous, 1.2mm long, conic. Style white, glabrous, 9mm long. Calyx 5-lobed. Lobes to 6mm long, 1mm broad, glabrous, green, acute to acuminate, with lighter margins.

Justicia americana flower

Flowering - May - October.

Habitat - Wet locations, typically in still water.

Origin - Native to U.S.

Other info. - The plant forms large mats or colonies on the shoreline of lakes, ponds and streams. It is very common. Although the flowers have a tremendous amount of purplish tint, they still look whitish from a distance.

Photographs taken at the Kansas City Zoo, 6-13-00, and along the shores of the Current River, Shannon County, MO., 6-13-03.


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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=JUAM ---> https://plants.usda.gov/java/profile?symbol=JUAM
https://plants.usda.gov/java/profile?symbol=JUAM ---> http://plants.usda.gov/core/profile?symbol=JUAM
http://plants.usda.gov/core/profile?symbol=JUAM ---> https://plants.usda.gov/core/profile?symbol=JUAM
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You are here: Home / Plant Profile

Justicia americana (L.) Vahl
American water-willow

Image of Justicia americana

General Information
Symbol: JUAM
Group: Dicot
Family: Acanthaceae
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 Justicia thumbnails at the Plants Gallery

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

©Elaine Haug. Provided by Smithsonian Institution, Department of Botany . United States, VA, Woodbridge, Leesylvania State Park. Usage Requirements .

©Lawrence S. Gilliam. United States, NC, Forsyth Co., lake margin. May 28, 2010. Usage Requirements .

©Lawrence S. Gilliam. United States, NC, Forsyth Co., lake margin. May 28, 2010. 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: 243. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

slideshow

Synonyms

Symbol Scientific Name
DIAM2 Dianthera americana L.
DIAMS Dianthera americana L. var. subcoriacea (Fernald) Shinners
JUAMS Justicia americana (L.) Vahl var. subcoriacea Fernald
JUMO2 Justicia mortuifluminis Fernald
JUUM Justicia umbratilis Fernald

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 Scrophulariales
Family Acanthaceae – Acanthus family
Genus Justicia L. – water-willow
Species Justicia americana (L.) Vahl – American water-willow

Subordinate Taxa

This plant has no children

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Iowa water-willow Endangered
Michigan water-willow Threatened

Wetland Status

Interpreting Wetland Status

North America
Arid West OBL
Atlantic and Gulf Coastal Plain OBL
Eastern Mountains and Piedmont OBL
Great Plains OBL
Midwest OBL
Northcentral & Northeast OBL

Related Links

More Accounts and Images
Integrated Taxonomic Information System (DIAM2)
Integrated Taxonomic Information System (DIAMS)
Integrated Taxonomic Information System (JUAM)
Integrated Taxonomic Information System (JUAMS)
Integrated Taxonomic Information System (JUMO2)
Integrated Taxonomic Information System (JUUM)
Lady Bird Johnson Wildflower Center Native Plant Information Network (JUAM)
USF Atlas of Florida Vascular Plants (JUAM)
University of Tennessee Herbarium (Distribution) (JUAM)
University of Wisconsin - Stevens Point Freckmann Herbarium (JUAM)

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=Justicia+americana&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=Justicia+americana&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 18
Query: SELECT * FROM img WHERE ready=1 and taxon like "Justicia americana%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Justicia americana
Justicia americana
ID: 0000 0000 0510 2591 [detail]
© 2010 Louis-M. Landry

Justicia americana
Justicia americana
ID: 0000 0000 0510 2592 [detail]
© 2010 Louis-M. Landry

Justicia americana
Justicia americana
ID: 0000 0000 0510 2593 [detail]
© 2010 Louis-M. Landry

Justicia americana
Justicia americana
ID: 0000 0000 0510 2594 [detail]
© 2010 Louis-M. Landry

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0037 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0036 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0035 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0034 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0033 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0032 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0031 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0030 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0029 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0028 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0027 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0026 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0025 [detail]
© 2016 Keir Morse

Justicia americana
Justicia americana
American Water-willow
ID: 0000 1111 1234 0024 [detail]
© 2016 Keir Morse

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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