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{{Taxobox
| color = lightgreen
| name = ''Justicia''
| image = Jacobinia magnifica02.jpg
| image_width = 200px
| image_caption = ''[[Justicia carnea]]''
| regnum = [[Plant]]ae
| divisio = [[flowering plant|Magnoliophyta]]
| classis = [[dicotyledon|Magnoliopsida]]
| ordo = [[Lamiales]]
| familia = [[Acanthaceae]]
| genus = '''''Justicia'''''
| genus_authority = [[L.]]
| subdivision_ranks = [[Species]]
| subdivision = See text.
}}

'''''Justicia''''' ([[Synonymy|syn.]] ''Acelica, Adhatoda, Amphiscopia, Anisostachya, Aulojusticia, Averia, Beloperone, Calliaspidia, Calymmostachya, Chaetothylopsis, Chiloglossa, Cyphisia, Cyrtanthera, Cyrtantherella, Dianthera, Dimanisa, Drejerella, Duvernoia, Emularia, Ethesia, Glosarithys, Harnieria, Heinzelia, Hemichoriste, Heteraspidia, Ixtlania, Jacobinia, Kuestera, Libonia, Lophothecium, Lustrinia, Nicoteba, Orthotactus, Parajusticia, Petalanthera, Plagiacanthus, Plegmatolemma, Porphyrocoma, Psacadocalymma, Rhacodiscus, Rhiphidosperma, Rhyticalymma, Rodatia, Rostellaria, Rostellularia, Saglorithys, Salviacanthus, Sarotheca, Sericographis, Simonisia, Solenochasma, Stethoma, Tabascina, Thalestris, Thamnojusticia, Tyloglossa'' in '''Plant Systematics''') is a genus of about 420 species of [[flowering plant]]s in the family [[Acanthaceae]], native to tropical to warm temperate regions of the [[Americas]], with two species occurring north into cooler temperate regions. Common names include '''water-willow''' and '''shrimp plant''', the latter from the [[inflorescence]]s, which resemble a [[shrimp]] in some species.

;Selected species
{|
|- valign=top
|
*''[[Justicia adhadota]]''
*''[[Justicia adhatodoides]]''
*''[[Justicia americana]]''
*''[[Justicia androsaemifolia]]''
*''[[Justicia angusta]]''
*''[[Justicia betonica]]''
*''[[Justicia borinquensis]]''
*''[[Justicia brandegeeana]]''
*''[[Justicia brasiliana]]''
*''[[Justicia californica]]''
*''[[Justicia candicans]]''
*''[[Justicia carnea]]''
*''[[Justicia carthagenensis]]''
|
*''[[Justicia comata]]''
*''[[Justicia cooleyi]]''
*''[[Justicia crassifolia]]''
*''[[Justicia culebritae]]''
*''[[Justicia cydoniifolia]]''
*''[[Justicia fulvicoma]]''
*''[[Justicia kotschyi]]''
*''[[Justicia leonardii]]''
*''[[Justicia martinsoniana]]''
*''[[Justicia mirabiloides]]''
*''[[Justicia orchioides]]''
*''[[Justicia ovata]]''
*''[[Justicia pectoralis]]''
|
*''[[Justicia plumbaginifolia]]''
*''[[Justicia procumbens]]''
*''[[Justicia quinqueangularis]]''
*''[[Justicia rizzinii]]''
*''[[Justicia runyonii]]''
*''[[Justicia secunda]]''
*''[[Justicia sonorae]]''
*''[[Justicia sphaerosperma]]''
*''[[Justicia spicigera]]''
*''[[Justicia tweediana]]''
*''[[Justicia warnockii]]''
*''[[Justicia wrightii]]''
|}

''Justicia americana'' (American Water-willow), is native to eastern [[North America]] north to southern [[Ontario]]; it is the hardiest species in the genus, hardy to USDA Plant Zone 4. ''Justicia ovata'' (Looseflower Water-willow) occurs nearly as far north, reaching [[Michigan]].

[[Image:TypicalAmericanWaterWillow.jpg|thumb|left|Typical habitat of American Water-willow (Justicia americana) on the [[Coosa River]] near [[Wetumpka, Alabama]]]]

''Justicia brandegeeana'' (formerly ''Beloperone guttata'', commonly called Shrimp Plant) is native to [[Mexico]]. It is hardy to −4 °C but will often recover in the spring after freezing back in USDA Plant Zone 8a.

''Justicia carnea'' (formerly ''Jacobinia carnea'', common names including Brazilian Plume Flower, Flamingo Flower, and Jacobinia) is native to [[South America]] in southern [[Brazil]], [[Paraguay]] and northern [[Argentina]]. It is hardy to −2 °C but will often recover in the spring after freezing back in USDA Plant Zone 8a.

==References==
*[http://132.236.163.181/cgi-bin/dol/dol_terminal.pl?genus=Justicia Plant Systematics: ''Justicia'']
*[http://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?6233 Germplasm Resources Information Network: ''Justicia'']
*[http://plants.usda.gov/java/profile?symbol=JUSTI USDA Plants Profile: ''Justicia'']

[[Category:Acanthaceae]]
[[Category:Justicia]]
{{botany-stub}}
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