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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
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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
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://plants.usda.gov/java/profile?symbol=JUAM

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
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) 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

Updated: 2017-12-18 18:50:18 gmt
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